diff --git a/src/proto/vim9compile.pro b/src/proto/vim9compile.pro
index 040e4d7..05f6d50 100644
--- a/src/proto/vim9compile.pro
+++ b/src/proto/vim9compile.pro
@@ -1,5 +1,5 @@
 /* vim9compile.c */
-int check_defined(char_u *p, int len, cctx_T *cctx);
+int check_defined(char_u *p, size_t len, cctx_T *cctx);
 type_T *typval2type(typval_T *tv);
 int check_type(type_T *expected, type_T *actual, int give_msg);
 char_u *skip_type(char_u *start);
diff --git a/src/version.c b/src/version.c
index ec1e12e..867eaf5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1148,
+/**/
     1147,
 /**/
     1146,
diff --git a/src/vim9compile.c b/src/vim9compile.c
index db24eae..c876da0 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -288,7 +288,7 @@
  * Return FAIL and give an error if it defined.
  */
     int
-check_defined(char_u *p, int len, cctx_T *cctx)
+check_defined(char_u *p, size_t len, cctx_T *cctx)
 {
     if (lookup_script(p, len) == OK
 	    || (cctx != NULL
diff --git a/src/vim9script.c b/src/vim9script.c
index ef447c7..77fe6b0 100644
--- a/src/vim9script.c
+++ b/src/vim9script.c
@@ -324,7 +324,7 @@
 	    if (eval_isnamec1(*arg))
 		while (eval_isnamec(*arg))
 		    ++arg;
-	    if (check_defined(p, (int)(arg - p), cctx) == FAIL)
+	    if (check_defined(p, arg - p, cctx) == FAIL)
 		goto erret;
 	    as_name = vim_strnsave(p, arg - p);
 	    arg = skipwhite_and_linebreak(arg, evalarg);