diff --git a/Makefile b/Makefile
index 5bb2795..10c1a11 100644
--- a/Makefile
+++ b/Makefile
@@ -21,6 +21,7 @@ clean:
 	@rm -f rotation *~ *.o .*.swp *.ppm *.pgm *.pnm cachegrind.out.* callgrind.out.*
 
 run: all
+	@rm -f rotated_*.pnm
 	$(BUILD_DIR)/rotation $(IMG)
 
 runall: all