diff --git a/CMakeLists.txt b/CMakeLists.txt
index fcccc5640..aba92ce5e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,7 +29,7 @@ set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake" "${CMAKE_MODULE_PATH}")
 set(CMAKE_SKIP_RPATH ON)
 
 # compiler options
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsigned-char -fms-extensions -Wall -Wextra -Werror-implicit-function-declaration")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsigned-char -fms-extensions -Wall -Wextra -Werror-implicit-function-declaration -Wformat -Werror=format-security")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsigned-char -fms-extensions -Wall -Wextra")
 if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
   # extra options specific to gcc/g++