diff --git a/builtin-fetch--tool.c b/builtin-fetch--tool.c
index e26817de21..6a78517958 100644
--- a/builtin-fetch--tool.c
+++ b/builtin-fetch--tool.c
@@ -25,7 +25,7 @@ static int update_ref_env(const char *action,
 		      unsigned char *oldval)
 {
 	char msg[1024];
-	char *rla = getenv("GIT_REFLOG_ACTION");
+	const char *rla = getenv("GIT_REFLOG_ACTION");
 
 	if (!rla)
 		rla = "(reflog update)";
@@ -61,7 +61,7 @@ static int update_local_ref(const char *name,
 	}
 
 	if (get_sha1(name, sha1_old)) {
-		char *msg;
+		const char *msg;
 	just_store:
 		/* new ref */
 		if (!strncmp(name, "refs/tags/", 10))
diff --git a/builtin-mailinfo.c b/builtin-mailinfo.c
index d7cb11dc0d..fb12248f82 100644
--- a/builtin-mailinfo.c
+++ b/builtin-mailinfo.c
@@ -288,7 +288,7 @@ static void cleanup_space(char *buf)
 }
 
 static void decode_header(char *it, unsigned itsize);
-static char *header[MAX_HDR_PARSED] = {
+static const char *header[MAX_HDR_PARSED] = {
 	"From","Subject","Date",
 };
 
diff --git a/builtin-reset.c b/builtin-reset.c
index 99d5c082a6..e1dc31e0eb 100644
--- a/builtin-reset.c
+++ b/builtin-reset.c
@@ -169,7 +169,7 @@ static void prepend_reflog_action(const char *action, char *buf, size_t size)
 }
 
 enum reset_type { MIXED, SOFT, HARD, NONE };
-static char *reset_type_names[] = { "mixed", "soft", "hard", NULL };
+static const char *reset_type_names[] = { "mixed", "soft", "hard", NULL };
 
 int cmd_reset(int argc, const char **argv, const char *prefix)
 {
diff --git a/match-trees.c b/match-trees.c
index d7e29c4d1d..0fd6df7d6e 100644
--- a/match-trees.c
+++ b/match-trees.c
@@ -132,7 +132,7 @@ static void match_trees(const unsigned char *hash1,
 			const unsigned char *hash2,
 			int *best_score,
 			char **best_match,
-			char *base,
+			const char *base,
 			int recurse_limit)
 {
 	struct tree_desc one;