diff --git a/configure b/configure
index 3cc28e459c..7dc4562c5d 100755
--- a/configure
+++ b/configure
@@ -7464,7 +7464,7 @@ if darwin ; then
   fi
 fi
 if amigaos ; then
-  CFLAGS="$CFLAGS -DNEWLIB -D__USE_INLINE__ -DSYS_AMIGAOS4"
+  CFLAGS="$CFLAGS -DNEWLIB -D__USE_INLINE__"
 fi
 if hpux ; then
   # use flag for HPUX missing setenv()