diff --git a/src/symbol-icon-theme.json b/src/symbol-icon-theme.json
index 6e4e72b..7f4c2ac 100644
--- a/src/symbol-icon-theme.json
+++ b/src/symbol-icon-theme.json
@@ -713,6 +713,7 @@
 		"gradle-wrapper.properties": "gradle",
 		"postcss.config.js": "postcss",
 		"postcss.config.cjs": "postcss",
+		"postcss.config.mjs": "postcss",
 		"postcss.config.ts": "postcss",
 		"postcss.config.cts": "postcss",
 		"postcss.config.mts": "postcss",