diff --git a/Externals/glslang/CMakeLists.txt b/Externals/glslang/CMakeLists.txt
index 3439a55dda..f288020542 100644
--- a/Externals/glslang/CMakeLists.txt
+++ b/Externals/glslang/CMakeLists.txt
@@ -60,7 +60,11 @@ add_compile_options(-Wno-reorder)
 add_compile_options(-Wno-sign-compare)
 add_compile_options(-Wno-parentheses)
 add_compile_options(-Wno-unused-variable)
-add_compile_options(-Wno-unused-but-set-variable)
+if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
+	add_compile_options(-Wno-unused-but-set-variable)
+elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+	add_compile_options(-Wno-missing-variable-declarations)
+endif()
 endif()
 
 add_library(glslang STATIC ${SRCS})