diff --git a/src/proto/strings.pro b/src/proto/strings.pro
index 8924a25..aa8b374 100644
--- a/src/proto/strings.pro
+++ b/src/proto/strings.pro
@@ -21,9 +21,9 @@
 void sort_strings(char_u **files, int count);
 int has_non_ascii(char_u *s);
 char_u *concat_str(char_u *str1, char_u *str2);
+char_u *reverse_text(char_u *s);
 char_u *string_quote(char_u *str, int function);
 long string_count(char_u *haystack, char_u *needle, int ic);
-void string_reverse(char_u *str, typval_T *rettv);
 void string_filter_map(char_u *str, filtermap_T filtermap, typval_T *expr, typval_T *rettv);
 void string_reduce(typval_T *argvars, typval_T *expr, typval_T *rettv);
 void f_byteidx(typval_T *argvars, typval_T *rettv);