diff --git a/cmake/modules/HandleLLVMOptions.cmake b/cmake/modules/HandleLLVMOptions.cmake
index f8a017dcaef..2939fa2afa2 100644
--- a/cmake/modules/HandleLLVMOptions.cmake
+++ b/cmake/modules/HandleLLVMOptions.cmake
@@ -266,3 +266,10 @@ endif()
 add_llvm_definitions( -D__STDC_CONSTANT_MACROS )
 add_llvm_definitions( -D__STDC_FORMAT_MACROS )
 add_llvm_definitions( -D__STDC_LIMIT_MACROS )
+
+# clang doesn't print colored diagnostics when invoked from Ninja
+if (UNIX AND
+    CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND
+    CMAKE_GENERATOR STREQUAL "Ninja")
+  append("-fcolor-diagnostics" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
+endif()