diff --git a/.github/workflows/build_linux.yml b/.github/workflows/build_linux.yml
index 165d772f9..67edeba65 100644
--- a/.github/workflows/build_linux.yml
+++ b/.github/workflows/build_linux.yml
@@ -9,7 +9,7 @@ jobs:
       matrix:
         include: 
           - build_name: "Debug Build & Unit Tests (gcc)"
-            cmd_deps: ""
+            cmd_deps: sudo apt-get install -y -qq mosquitto
             cmd_action: unit_tests
           - build_name: "Debug Build & Unit Tests (gcc, 32bit)"
             cmd_deps: |
@@ -30,10 +30,10 @@ jobs:
             cmd_deps: ""
             cmd_action: unit_tests_alarms
           - build_name: "Debug Build & Unit Tests (clang)"
-            cmd_deps: sudo apt-get install -y -qq clang-11 clang-tools-11
+            cmd_deps: sudo apt-get install -y -qq clang-11 clang-tools-11 mosquitto
             cmd_action: CC=clang-11 CXX=clang++-11 unit_tests
           - build_name: "Debug Build & Unit Tests (tcc)"
-            cmd_deps: sudo apt-get install -y -qq tcc
+            cmd_deps: sudo apt-get install -y -qq tcc mosquitto
             cmd_action: CC=tcc unit_tests
           - build_name: "Encryption (MbedTLS) Build & Unit Tests (gcc)"
             cmd_deps: sudo apt-get install -y -qq libmbedtls-dev
diff --git a/tools/ci.sh b/tools/ci.sh
index 5543d10f8..fafee93c9 100644
--- a/tools/ci.sh
+++ b/tools/ci.sh
@@ -145,6 +145,7 @@ function unit_tests {
           -DUA_ENABLE_PUBSUB_DELTAFRAMES=ON \
           -DUA_ENABLE_PUBSUB_INFORMATIONMODEL=ON \
           -DUA_ENABLE_PUBSUB_MONITORING=ON \
+          -DUA_ENABLE_PUBSUB_MQTT=ON \
           ..
     make ${MAKEOPTS}
     set_capabilities