diff --git a/Makefile b/Makefile
index 171013cd..f789c987 100644
--- a/Makefile
+++ b/Makefile
@@ -60,7 +60,7 @@ reindent: ocp-indent
 
 WATCH=all
 watch:
-	while find src/ -print0 | xargs -0 inotifywait -e delete_self -e modify ; do \
+	while find src/ tests/ -print0 | xargs -0 inotifywait -e delete_self -e modify ; do \
 		echo "============ at `date` ==========" ; \
 		make $(WATCH); \
 	done