diff --git a/src/graph.c b/src/graph.c
index be6080e0..1f006606 100644
--- a/src/graph.c
+++ b/src/graph.c
@@ -374,6 +374,9 @@ void dump_graph(void)
 		pclose(file);
 	} else {
 		fclose(file);
+#ifdef HAVE_MINGW
+		unlink(filename);
+#endif
 		rename(tmpname, filename);
 		free(tmpname);
 	}