diff --git a/.github/workflows/checkCI.yml b/.github/workflows/checkCI.yml
index efd9ef213e..af7638e35f 100644
--- a/.github/workflows/checkCI.yml
+++ b/.github/workflows/checkCI.yml
@@ -79,7 +79,7 @@ jobs:
             cmake -S "$SRCDIR" -B build -DMODELICA_UTILITIES_INCLUDE_DIR="$TESTDIR" -DMODELICA_DEBUG_TIME_EVENTS=ON -DCMAKE_BUILD_TYPE=${{ matrix.configuration }} -G "MinGW Makefiles"
             cmake --build build
           else
-            cmake -S "$SRCDIR" -B build -DMODELICA_UTILITIES_INCLUDE_DIR="$TESTDIR" -DMODELICA_DEBUG_TIME_EVENTS=ON -DCMAKE_BUILD_TYPE=${{ matrix.configuration }}
+            cmake -S "$SRCDIR" -B build -DMODELICA_UTILITIES_INCLUDE_DIR="$TESTDIR" -DMODELICA_DEBUG_TIME_EVENTS=ON -DCMAKE_BUILD_TYPE=${{ matrix.configuration }} -DCMAKE_C_FLAGS="-std=c89 -Wall -Wextra"
             cmake --build build
           fi
         env: