diff --git a/src/merge.c b/src/merge.c
index 2cbf531f9..115867971 100644
--- a/src/merge.c
+++ b/src/merge.c
@@ -1649,7 +1649,7 @@ static int write_merge_head(
 		goto cleanup;
 
 	for (i = 0; i < heads_len; i++) {
-		if ((error = git_filebuf_printf(&file, "%s\n", &heads[i]->oid_str)) < 0)
+		if ((error = git_filebuf_printf(&file, "%s\n", heads[i]->oid_str)) < 0)
 			goto cleanup;
 	}
 
@@ -2240,6 +2240,8 @@ static int merge_check_workdir(size_t *conflicts, git_repository *repo, git_inde
 	git_diff_options opts = GIT_DIFF_OPTIONS_INIT;
 	int error = 0;
 
+	GIT_UNUSED(index_new);
+
 	*conflicts = 0;
 
 	opts.flags |= GIT_DIFF_INCLUDE_UNTRACKED;
diff --git a/src/netops.c b/src/netops.c
index 592e46449..15ed0fc26 100644
--- a/src/netops.c
+++ b/src/netops.c
@@ -662,7 +662,7 @@ void gitno_connection_data_free_ptrs(gitno_connection_data *d)
 static char* unescape(char *str)
 {
 	int x, y;
-	size_t len = strlen(str);
+	int len = (int)strlen(str);
 
 	for (x=y=0; str[y]; ++x, ++y) {
 		if ((str[x] = str[y]) == '%') {
diff --git a/src/push.c b/src/push.c
index 5ad15e3fd..3c9d5bb35 100644
--- a/src/push.c
+++ b/src/push.c
@@ -618,7 +618,7 @@ on_error:
 
 static int filter_refs(git_remote *remote)
 {
-	git_remote_head **heads;
+	const git_remote_head **heads;
 	size_t heads_len, i;
 
 	git_vector_clear(&remote->refs);
@@ -627,7 +627,7 @@ static int filter_refs(git_remote *remote)
 		return -1;
 
 	for (i = 0; i < heads_len; i++) {
-		if (git_vector_insert(&remote->refs, heads[i]) < 0)
+		if (git_vector_insert(&remote->refs, (void *)heads[i]) < 0)
 			return -1;
 	}
 
diff --git a/tests-clar/merge/workdir/setup.c b/tests-clar/merge/workdir/setup.c
index 463dee06e..870d55ef2 100644
--- a/tests-clar/merge/workdir/setup.c
+++ b/tests-clar/merge/workdir/setup.c
@@ -1041,7 +1041,8 @@ void test_merge_workdir_setup__removed_after_failure(void)
 	cl_git_rewritefile("merge-resolve/new-in-octo1.txt",
 		"Conflicting file!\n\nMerge will fail!\n");
 
-	cl_git_fail(git_merge(&result, repo, &their_heads[0], 1, &opts));
+	cl_git_fail(git_merge(
+		&result, repo, (const git_merge_head **)&their_heads[0], 1, &opts));
 
 	cl_assert(!git_path_exists("merge-resolve/" GIT_MERGE_HEAD_FILE));
 	cl_assert(!git_path_exists("merge-resolve/" GIT_ORIG_HEAD_FILE));