diff --git a/GNUmakefile b/GNUmakefile
index 15f74d746ac..e60004cb031 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -514,7 +514,7 @@ check_spelling_shaders: .FORCE
 	PYTHONIOENCODING=utf_8 $(PYTHON) \
 	    "$(BLENDER_DIR)/tools/check_source/check_spelling.py" \
 	    --cache-file=$(CHECK_SPELLING_CACHE) \
-	    --match=".*\.(osl|msl|glsl)$$" \
+	    --match=".*\.(osl|metal|msl|glsl)$$" \
 	    "$(BLENDER_DIR)/intern/" \
 	    "$(BLENDER_DIR)/source/"
 
diff --git a/tools/check_source/check_spelling.py b/tools/check_source/check_spelling.py
index d6f378f2c4f..4dc22da1333 100755
--- a/tools/check_source/check_spelling.py
+++ b/tools/check_source/check_spelling.py
@@ -79,6 +79,7 @@ SOURCE_EXT = (
     "hh",
     "m",
     "mm",
+    "metal",
     "msl",
     "glsl",
     "osl",