diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 10def122..2f78e100 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,5 +1,5 @@
 # Compile flags as defined in global CMakeLists
-set(CMAKE_CXX_FLAGS "${COLOBOT_CXX_FLAGS}")
+set(CMAKE_CXX_FLAGS ${COLOBOT_CXX_FLAGS})
 set(CMAKE_CXX_FLAGS_RELEASE ${COLOBOT_CXX_FLAGS_RELEASE})
 set(CMAKE_CXX_FLAGS_DEBUG ${COLOBOT_CXX_FLAGS_DEBUG})