diff --git a/builtin/diff.c b/builtin/diff.c
index 1118689fb2..0fe638fc45 100644
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -182,7 +182,7 @@ static int builtin_diff_combined(struct rev_info *revs,
 		hashcpy((unsigned char *)(parent + i), ent[i].item->sha1);
 	diff_tree_combined(parent[0], parent + 1, ents - 1,
 			   revs->dense_combined_merges, revs);
-	free(parent);
+	free((void *)parent);
 	return 0;
 }
 
diff --git a/submodule.c b/submodule.c
index ad86534ba1..09181ff6e5 100644
--- a/submodule.c
+++ b/submodule.c
@@ -385,7 +385,7 @@ static void commit_need_pushing(struct commit *commit, struct commit_list *paren
 	rev.diffopt.format_callback_data = needs_pushing;
 	diff_tree_combined(commit->object.sha1, parents, n, 1, &rev);
 
-	free(parents);
+	free((void *)parents);
 }
 
 int check_submodule_needs_pushing(unsigned char new_sha1[20], const char *remotes_name)