diff --git a/build_tests.sh b/build_tests.sh
index d435845..fff9526 100644
--- a/build_tests.sh
+++ b/build_tests.sh
@@ -6,10 +6,8 @@ mkdir --parents build
 echo "[SCRIPT] Building tests via gcc to build/intc_tests_cpp_gcc"
 pushd build
 g++ -O2 -D INTC_TESTS_WITH_MAIN -I ${script_dir} ${script_dir}/intc_tests.c -o intc_tests_cpp_gcc
-popd
 
 echo "[SCRIPT] Building tests via gcc to build/intc_tests_c_gcc"
-pushd build
-gcc -O2 -D INTC_TESTS_WITH_MAIN -I ${script_dir} ${script_dir}/intc_tests.c -o intc_tests_c_gcc
+gcc -std=c99 -O2 -D INTC_TESTS_WITH_MAIN -I ${script_dir} ${script_dir}/intc_tests.c -o intc_tests_c_gcc
 popd