diff --git a/Makefile.am b/Makefile.am
index 6a6186906..561421c8b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -283,6 +283,7 @@ checksrc:
 	cd lib && $(MAKE) checksrc
 	cd src && $(MAKE) checksrc
 	cd tests && $(MAKE) checksrc
+	cd include/curl && $(MAKE) checksrc
 
 .PHONY: vc-ide