diff --git a/.github/codeql/codeql-config.yml b/.github/codeql/codeql-config.yml
index 91f82b842b..6036043d8c 100644
--- a/.github/codeql/codeql-config.yml
+++ b/.github/codeql/codeql-config.yml
@@ -1,3 +1,7 @@
 name: "CodeQL config for the Ruby language"
 
 languages: cpp
+
+# syntax_suggest consumes an hour.
+paths-ignore:
+  - lib/syntax_suggest