diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 4a83ca0..b5c636c 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -7286,7 +7286,7 @@
 	    if (p == NULL || *p == NUL)	/* empty is the same as not set */
 		NameBuff[0] = NUL;
 	    else
-		STRNCPY(NameBuff, p, MAXPATHL);
+		vim_strncpy(NameBuff, p, MAXPATHL - 1);
 # else
 	    expand_env((char_u *)"$HOME", NameBuff, MAXPATHL);
 # endif