diff --git a/CMakeLists.txt b/CMakeLists.txt
index 31a04b569..f8dc38d01 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -296,7 +296,7 @@ endif (WITH_PROF)
 if (OPTION_OMP)
     find_package(OpenMP)
     if (OPENMP_FOUND)
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS} -Werror=unknown-pragmas")
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS} -Werror=unknown-pragmas -Wall")
     endif (OPENMP_FOUND)
 endif (OPTION_OMP)