diff --git a/cmake/flags.cmake b/cmake/flags.cmake
index eb451dbf8609d8b656a1e00e634489af6a6143d5..b8a37b5513c34da615fcf75aa8fb91263526b326 100644
--- a/cmake/flags.cmake
+++ b/cmake/flags.cmake
@@ -214,7 +214,7 @@ if(APPLE)
         CACHE STRING "Build architectures for OSX" FORCE)
   endif()
   # On Mac OS X register class specifier is deprecated and will cause warning error on latest clang 10.0
-  set(COMMON_FLAGS -Wno-deprecated-register)
+  set(COMMON_FLAGS -Wno-deprecated-register -Werror=format)
 endif()
 
 if(WITH_HETERPS AND WITH_PSLIB)