diff --git a/Makefile b/Makefile
index bd8e44da0a4..9a69b240110 100644
--- a/Makefile
+++ b/Makefile
@@ -263,6 +263,7 @@ clobber: FORCE
 	rm -rf lib
 	rm -rf build
 	rm -f util/chplenv/*.pyc
+	rm -rf util/chplenv/__pycache__
 	rm -f compiler/main/CONFIGURED_PREFIX
 # these files might be generated by ./configure
 	rm -f configured-chplconfig configured-prefix configured-chpl-home chplconfig