diff --git a/commit.h b/commit.h
index ba9f63813eba004ae409eba8741266a074161239..4886544b631bd6b79ad8410fa369e41975c0ff23 100644
--- a/commit.h
+++ b/commit.h
@@ -64,6 +64,7 @@ enum cmit_fmt {
 };
 
 extern int non_ascii(int);
+extern int has_non_ascii(const char *text);
 struct rev_info; /* in revision.h, it circularly uses enum cmit_fmt */
 extern char *reencode_commit_message(const struct commit *commit,
 				     const char **encoding_p);
diff --git a/log-tree.c b/log-tree.c
index 6f73c17d74bee326a40505b29bba762bade2451e..a3b4c0692c6a46a0642cf1cb42e60eee59110d60 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -168,18 +168,6 @@ static unsigned int digits_in_number(unsigned int number)
 	return result;
 }
 
-static int has_non_ascii(const char *s)
-{
-	int ch;
-	if (!s)
-		return 0;
-	while ((ch = *s++) != '\0') {
-		if (non_ascii(ch))
-			return 1;
-	}
-	return 0;
-}
-
 void get_patch_filename(struct commit *commit, int nr, const char *suffix,
 			struct strbuf *buf)
 {
diff --git a/pretty.c b/pretty.c
index e5328dab5b2978d90d20f47ed799782e7b2fb63b..3b2ecdd20e6f5bdca61ee5e605deac7b8239c70d 100644
--- a/pretty.c
+++ b/pretty.c
@@ -86,6 +86,18 @@ int non_ascii(int ch)
 	return !isascii(ch) || ch == '\033';
 }
 
+int has_non_ascii(const char *s)
+{
+	int ch;
+	if (!s)
+		return 0;
+	while ((ch = *s++) != '\0') {
+		if (non_ascii(ch))
+			return 1;
+	}
+	return 0;
+}
+
 static int is_rfc2047_special(char ch)
 {
 	return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));