--- src/search.c
+++ src/search.c
@@ -641,7 +641,8 @@
 	      break;
 	    if (try + len < buf + size && WCHAR((unsigned char) try[len]))
 	      {
-		offset = kwsexec (kwset, beg, --len, &kwsmatch);
+		++beg;
+		offset = kwsexec (kwset, beg, buf + size - beg, &kwsmatch);
 		if (offset == (size_t) -1)
 		  {
 #ifdef MBS_SUPPORT