diff --git a/modules/lang/cc/config.el b/modules/lang/cc/config.el
index 4f30e5395..4708676c5 100644
--- a/modules/lang/cc/config.el
+++ b/modules/lang/cc/config.el
@@ -253,4 +253,11 @@ This is ignored by ccls.")
   (after! projectile
     (add-to-list 'projectile-globally-ignored-directories ".ccls-cache")
     (add-to-list 'projectile-project-root-files-bottom-up ".ccls-root")
-    (add-to-list 'projectile-project-root-files-top-down-recurring "compile_commands.json")))
+    (add-to-list 'projectile-project-root-files-top-down-recurring "compile_commands.json"))
+  :config
+  (when IS-MAC
+    (setq ccls-initialization-options
+          `(:clang ,(list :extraArgs ["-isystem/Library/Developer/CommandLineTools/usr/include/c++/v1"
+                                      "-isystem/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include"
+                                      "-isystem/usr/local/include"]
+                          :resourceDir (string-trim (shell-command-to-string "clang -print-resource-dir")))))))