diff --git a/m-string.h b/m-string.h
index e5ee6020..fe7c2eb8 100644
--- a/m-string.h
+++ b/m-string.h
@@ -1054,7 +1054,7 @@ static inline int stringi_utf8_encode(char buffer[5], string_unicode_t u)
 }
 
 /* Iterator on a string over UTF8 encoded characters */
-typedef struct {
+typedef struct string_it_s {
   string_unicode_t u;
   const char *ptr;
   const char *next_ptr;