diff --git a/src/R3/Operators/Zip.cs b/src/R3/Operators/Zip.cs
index 19a747e..c03f50d 100644
--- a/src/R3/Operators/Zip.cs
+++ b/src/R3/Operators/Zip.cs
@@ -241,7 +241,6 @@ internal sealed class Zip<T1, T2, TResult>(
         readonly ZipObserver<T2> observer2;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _Zip(
             Observer<TResult> observer,
@@ -371,7 +370,6 @@ internal sealed class Zip<T1, T2, T3, TResult>(
         readonly ZipObserver<T3> observer3;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _Zip(
             Observer<TResult> observer,
@@ -509,7 +507,6 @@ internal sealed class Zip<T1, T2, T3, T4, TResult>(
         readonly ZipObserver<T4> observer4;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _Zip(
             Observer<TResult> observer,
@@ -655,7 +652,6 @@ internal sealed class Zip<T1, T2, T3, T4, T5, TResult>(
         readonly ZipObserver<T5> observer5;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _Zip(
             Observer<TResult> observer,
@@ -809,7 +805,6 @@ internal sealed class Zip<T1, T2, T3, T4, T5, T6, TResult>(
         readonly ZipObserver<T6> observer6;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _Zip(
             Observer<TResult> observer,
@@ -971,7 +966,6 @@ internal sealed class Zip<T1, T2, T3, T4, T5, T6, T7, TResult>(
         readonly ZipObserver<T7> observer7;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _Zip(
             Observer<TResult> observer,
@@ -1141,7 +1135,6 @@ internal sealed class Zip<T1, T2, T3, T4, T5, T6, T7, T8, TResult>(
         readonly ZipObserver<T8> observer8;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _Zip(
             Observer<TResult> observer,
@@ -1319,7 +1312,6 @@ internal sealed class Zip<T1, T2, T3, T4, T5, T6, T7, T8, T9, TResult>(
         readonly ZipObserver<T9> observer9;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _Zip(
             Observer<TResult> observer,
@@ -1505,7 +1497,6 @@ internal sealed class Zip<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, TResult>(
         readonly ZipObserver<T10> observer10;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _Zip(
             Observer<TResult> observer,
@@ -1699,7 +1690,6 @@ internal sealed class Zip<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, TResult>
         readonly ZipObserver<T11> observer11;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _Zip(
             Observer<TResult> observer,
@@ -1901,7 +1891,6 @@ internal sealed class Zip<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, TRe
         readonly ZipObserver<T12> observer12;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _Zip(
             Observer<TResult> observer,
@@ -2111,7 +2100,6 @@ internal sealed class Zip<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13
         readonly ZipObserver<T13> observer13;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _Zip(
             Observer<TResult> observer,
@@ -2329,7 +2317,6 @@ internal sealed class Zip<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13
         readonly ZipObserver<T14> observer14;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _Zip(
             Observer<TResult> observer,
@@ -2555,7 +2542,6 @@ internal sealed class Zip<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13
         readonly ZipObserver<T15> observer15;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _Zip(
             Observer<TResult> observer,
diff --git a/src/R3/Operators/Zip.tt b/src/R3/Operators/Zip.tt
index c6b541d..9e2287e 100644
--- a/src/R3/Operators/Zip.tt
+++ b/src/R3/Operators/Zip.tt
@@ -55,7 +55,6 @@ internal sealed class Zip<<#= generateT(i) #>, TResult>(
         readonly ZipObserver<T<#= j #>> observer<#= j #>;
 <# } #>        
         readonly object gate = new object();
-        int completedCount;
 
         public _Zip(
             Observer<TResult> observer,
diff --git a/src/R3/Operators/ZipLatest.cs b/src/R3/Operators/ZipLatest.cs
index 7e74243..ba762ae 100644
--- a/src/R3/Operators/ZipLatest.cs
+++ b/src/R3/Operators/ZipLatest.cs
@@ -241,7 +241,6 @@ internal sealed class ZipLatest<T1, T2, TResult>(
         readonly ZipLatestObserver<T2> observer2;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _ZipLatest(
             Observer<TResult> observer,
@@ -374,7 +373,6 @@ internal sealed class ZipLatest<T1, T2, T3, TResult>(
         readonly ZipLatestObserver<T3> observer3;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _ZipLatest(
             Observer<TResult> observer,
@@ -515,7 +513,6 @@ internal sealed class ZipLatest<T1, T2, T3, T4, TResult>(
         readonly ZipLatestObserver<T4> observer4;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _ZipLatest(
             Observer<TResult> observer,
@@ -664,7 +661,6 @@ internal sealed class ZipLatest<T1, T2, T3, T4, T5, TResult>(
         readonly ZipLatestObserver<T5> observer5;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _ZipLatest(
             Observer<TResult> observer,
@@ -821,7 +817,6 @@ internal sealed class ZipLatest<T1, T2, T3, T4, T5, T6, TResult>(
         readonly ZipLatestObserver<T6> observer6;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _ZipLatest(
             Observer<TResult> observer,
@@ -986,7 +981,6 @@ internal sealed class ZipLatest<T1, T2, T3, T4, T5, T6, T7, TResult>(
         readonly ZipLatestObserver<T7> observer7;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _ZipLatest(
             Observer<TResult> observer,
@@ -1159,7 +1153,6 @@ internal sealed class ZipLatest<T1, T2, T3, T4, T5, T6, T7, T8, TResult>(
         readonly ZipLatestObserver<T8> observer8;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _ZipLatest(
             Observer<TResult> observer,
@@ -1340,7 +1333,6 @@ internal sealed class ZipLatest<T1, T2, T3, T4, T5, T6, T7, T8, T9, TResult>(
         readonly ZipLatestObserver<T9> observer9;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _ZipLatest(
             Observer<TResult> observer,
@@ -1529,7 +1521,6 @@ internal sealed class ZipLatest<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, TResult
         readonly ZipLatestObserver<T10> observer10;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _ZipLatest(
             Observer<TResult> observer,
@@ -1726,7 +1717,6 @@ internal sealed class ZipLatest<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, TR
         readonly ZipLatestObserver<T11> observer11;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _ZipLatest(
             Observer<TResult> observer,
@@ -1931,7 +1921,6 @@ internal sealed class ZipLatest<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T1
         readonly ZipLatestObserver<T12> observer12;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _ZipLatest(
             Observer<TResult> observer,
@@ -2144,7 +2133,6 @@ internal sealed class ZipLatest<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T1
         readonly ZipLatestObserver<T13> observer13;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _ZipLatest(
             Observer<TResult> observer,
@@ -2365,7 +2353,6 @@ internal sealed class ZipLatest<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T1
         readonly ZipLatestObserver<T14> observer14;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _ZipLatest(
             Observer<TResult> observer,
@@ -2594,7 +2581,6 @@ internal sealed class ZipLatest<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T1
         readonly ZipLatestObserver<T15> observer15;
         
         readonly object gate = new object();
-        int completedCount;
 
         public _ZipLatest(
             Observer<TResult> observer,
diff --git a/src/R3/Operators/ZipLatest.tt b/src/R3/Operators/ZipLatest.tt
index 9383586..023ceb7 100644
--- a/src/R3/Operators/ZipLatest.tt
+++ b/src/R3/Operators/ZipLatest.tt
@@ -55,7 +55,6 @@ internal sealed class ZipLatest<<#= generateT(i) #>, TResult>(
         readonly ZipLatestObserver<T<#= j #>> observer<#= j #>;
 <# } #>        
         readonly object gate = new object();
-        int completedCount;
 
         public _ZipLatest(
             Observer<TResult> observer,