diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 2d4117d..c7e6316 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -3392,7 +3392,7 @@
     /* Find start of last argument (argument just before cursor): */
     p = buff;
     xp->xp_pattern = p;
-    len = STRLEN(buff);
+    len = (int)STRLEN(buff);
     while (*p && p < buff + len)
     {
 	if (*p == ' ' || *p == TAB)