diff --git a/CMake/CCache.cmake b/CMake/CCache.cmake
index 5cd4c9c478..a8ee5da473 100644
--- a/CMake/CCache.cmake
+++ b/CMake/CCache.cmake
@@ -3,17 +3,15 @@ if(CCACHE_BIN)
     # Official ccache recommendation is to set CMAKE_C(XX)_COMPILER_LAUNCHER
     if (NOT CMAKE_C_COMPILER_LAUNCHER MATCHES "ccache")
         list(INSERT CMAKE_C_COMPILER_LAUNCHER 0 "${CCACHE_BIN}")
-        # ccache uses -I when compiling without preprocessor, which makes clang complain.
-        if("${CMAKE_C_COMPILER_ID}" STREQUAL "Clang")
-            set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Qunused-arguments -fcolor-diagnostics")
-        endif()
     endif()
 
     if (NOT CMAKE_CXX_COMPILER_LAUNCHER MATCHES "ccache")
         list(INSERT CMAKE_CXX_COMPILER_LAUNCHER 0 "${CCACHE_BIN}")
-        # ccache uses -I when compiling without preprocessor, which makes clang complain.
-        if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
-            set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Qunused-arguments -fcolor-diagnostics")
-        endif()
+    endif()
+
+    # ccache uses -I when compiling without preprocessor, which makes clang complain.
+    if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+        set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Qunused-arguments -fcolor-diagnostics")
+        set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Qunused-arguments -fcolor-diagnostics")
     endif()
 endif()