diff --git a/Makefile b/Makefile
index ef8de4a754f..76267262c15 100644
--- a/Makefile
+++ b/Makefile
@@ -2154,10 +2154,12 @@ FIND_SOURCE_FILES = ( \
 		'*.[hcS]' \
 		'*.sh' \
 		':!*[tp][0-9][0-9][0-9][0-9]*' \
+		':!contrib' \
 		2>/dev/null || \
 	$(FIND) . \
 		\( -name .git -type d -prune \) \
 		-o \( -name '[tp][0-9][0-9][0-9][0-9]*' -prune \) \
+		-o \( -name contrib -type d -prune \) \
 		-o \( -name build -type d -prune \) \
 		-o \( -name 'trash*' -type d -prune \) \
 		-o \( -name '*.[hcS]' -type f -print \) \