diff --git a/Makefile b/Makefile
index af47822..33816de 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ all: $(TARGETS) $(EXTRAS)
 
 .PHONY: clean
 clean:
-	rm -f $(TARGETS) $(EXTRAS) *~
+	rm -f $(TARGETS) $(EXTRAS) *.o *~
 
 mandelbrot: mandelbrot.c
 	$(CC) $(CFLAGS) $(shell sdl-config --cflags) -o $@ $< $(shell sdl-config --libs) -lm