diff --git a/cmake/flags-gcc.cmake b/cmake/flags-gcc.cmake
index 3339ad063..e1bf3650e 100644
--- a/cmake/flags-gcc.cmake
+++ b/cmake/flags-gcc.cmake
@@ -14,7 +14,7 @@
 #
 
 # Define our flags
-string(APPEND CMAKE_C_FLAGS_INIT                " -fomit-frame-pointer -Wall -fno-strict-aliasing")
+string(APPEND CMAKE_C_FLAGS_INIT                " -fomit-frame-pointer -Wall -fno-strict-aliasing -Werror=implicit-int -Werror=implicit-function-declaration -Werror=int-conversion -Werror=strict-prototypes -Werror=old-style-definition")
 string(APPEND CMAKE_CXX_FLAGS_INIT              " -fomit-frame-pointer -Wall -fno-strict-aliasing")
 string(APPEND CMAKE_C_FLAGS_RELEASE_INIT        " -g0 -O3")
 string(APPEND CMAKE_CXX_FLAGS_RELEASE_INIT      " -g0 -O3")
@@ -32,4 +32,4 @@ foreach(LANG C;CXX)
         set(CMAKE_${LANG}_FLAGS_${CONFIG} "${CMAKE_${LANG}_FLAGS_${CONFIG}_INIT}" CACHE STRING "Flags used by the ${LANG} compiler during ${CONFIG} builds.")
         mark_as_advanced(CMAKE_${LANG}_FLAGS_${CONFIG})
     endforeach()
-endforeach()
\ No newline at end of file
+endforeach()