The interdiff:

diff --git a/builtin-clone.c b/builtin-clone.c
index a45179c..ecdcefa 100644
--- a/builtin-clone.c
+++ b/builtin-clone.c
@@ -347,6 +347,7 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 	char branch_top[256], key[256], value[256];
 	struct strbuf reflog_msg;
 	struct transport *transport = NULL;
+	char *src_ref_prefix = "refs/heads/";
 
 	struct refspec refspec;
 
@@ -445,7 +446,9 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 	git_config(git_default_config, NULL);
 
 	if (option_bare) {
-		strcpy(branch_top, "refs/heads/");
+		if (option_mirror)
+			src_ref_prefix = "refs/";
+		strcpy(branch_top, src_ref_prefix);
 
 		git_config_set("core.bare", "true");
 	} else {
@@ -455,18 +458,24 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 
 	if (option_mirror || !option_bare) {
 		/* Configure the remote */
+		if (option_mirror) {
+			snprintf(key, sizeof(key),
+					"remote.%s.mirror", option_origin);
+			git_config_set(key, "true");
+		}
+
 		snprintf(key, sizeof(key), "remote.%s.url", option_origin);
 		git_config_set(key, repo);
 
 		snprintf(key, sizeof(key), "remote.%s.fetch", option_origin);
 		snprintf(value, sizeof(value),
-				"+refs/heads/*:%s*", branch_top);
+				"+%s*:%s*", src_ref_prefix, branch_top);
 		git_config_set_multivar(key, value, "^$", 0);
 	}
 
 	refspec.force = 0;
 	refspec.pattern = 1;
-	refspec.src = "refs/heads/";
+	refspec.src = src_ref_prefix;
 	refspec.dst = branch_top;
 
 	if (path && !is_bundle)
diff --git a/t/t5601-clone.sh b/t/t5601-clone.sh
index 4b2533f..9cd5ef4 100755
--- a/t/t5601-clone.sh
+++ b/t/t5601-clone.sh
@@ -76,7 +76,7 @@ test_expect_success 'clone --mirror' '
 	test -f mirror/HEAD &&
 	test ! -f mirror/file &&
 	FETCH="$(cd mirror && git config remote.origin.fetch)" &&
-	test "+refs/heads/*:refs/heads/*" = "$FETCH"
+	test "+refs/*:refs/*" = "$FETCH"
 
 '
 

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