diff --git a/src/hb-common.h b/src/hb-common.h
index 92f77c417..920bd3278 100644
--- a/src/hb-common.h
+++ b/src/hb-common.h
@@ -96,7 +96,8 @@ typedef uint32_t hb_tag_t;
 #define HB_TAG_NONE HB_TAG(0,0,0,0)
 
 /* len=-1 means str is NUL-terminated */
-hb_tag_t hb_tag_from_string (const char *str, int len);
+hb_tag_t
+hb_tag_from_string (const char *str, int len);
 
 
 /* hb_direction_t */