diff --git a/src/mark.c b/src/mark.c
index 2b03919..9bab352 100644
--- a/src/mark.c
+++ b/src/mark.c
@@ -540,10 +540,9 @@
 #endif
 		))
     {
-	int len;
+	size_t len;
 
-	expand_env((char_u *)"~/", NameBuff, MAXPATHL);
-	len = (int)STRLEN(NameBuff);
+	len = expand_env((char_u *)"~/", NameBuff, MAXPATHL);
 	vim_strncpy(NameBuff + len, fm->fname + 2, MAXPATHL - len - 1);
     }
     else