1 files changed, 2 insertions, 2 deletions
diff --git a/string.c b/string.c
index ca4ad9cf61..3a278b898f 100644
--- a/string.c
+++ b/string.c
@@ -913,7 +913,7 @@ str_sub_s(str, pat, val, once)
 	}
 
 	if (once) break;
-	if (offset >= STRLEN(str)) break;
+	if (offset > STRLEN(str)) break;
     }
     if (n == 0) return Qnil;
     if (RSTRING(str)->len > offset) {
@@ -996,7 +996,7 @@ str_sub_iter_s(str, pat, once)
 	}
 
 	if (once) break;
-	if (offset >= STRLEN(str)) break;
+	if (offset > STRLEN(str)) break;
     }
     if (n == 0) return Qnil;
     if (RSTRING(str)->len > offset) {