diff --git a/src/buffer.c b/src/buffer.c
index 0a2ce8e..5998523 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -3058,7 +3058,7 @@
 
     *p++ = '"';
     if (buf_spname(curbuf) != NULL)
-	STRCPY(p, buf_spname(curbuf));
+	vim_strncpy(p, buf_spname(curbuf), IOSIZE - (p - buffer) - 1);
     else
     {
 	if (!fullname && curbuf->b_fname != NULL)