diff --git a/src/quickfix.c b/src/quickfix.c
index 883de8c..3ecc81c 100644
--- a/src/quickfix.c
+++ b/src/quickfix.c
@@ -898,7 +898,7 @@
     qi->qf_lists[qi->qf_curlist].qf_count = 0;
     if (qf_title != NULL)
     {
-	char_u *p = alloc(STRLEN(qf_title) + 2);
+	char_u *p = alloc((int)STRLEN(qf_title) + 2);
 
 	qi->qf_lists[qi->qf_curlist].qf_title = p;
 	if (p != NULL)