diff --git a/Makefile b/Makefile
index 85167f6cd..e303d65b5 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ BUILD = build
 all: $(BUILD)/plasma_store $(BUILD)/plasma_client.so $(BUILD)/example
 
 clean:
-	rm $(BUILD)/*
+	rm -r $(BUILD)/*
 
 $(BUILD)/plasma_store: src/plasma_store.c src/plasma.h src/fling.h src/fling.c
 	$(CC) $(CFLAGS) --std=c99 -D_XOPEN_SOURCE=500 src/plasma_store.c src/fling.c -o $(BUILD)/plasma_store