diff --git a/CMakeLists.txt b/CMakeLists.txt
index 41b9bab..32c75a6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,7 +30,7 @@ project(gattlib)
 find_package(PkgConfig REQUIRED)
 
 # Show all the warnings
-set(CMAKE_C_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")
 # Expose 'gattlib.h' to all sub-directories
 include_directories(include)