diff --git a/src/filepath.c b/src/filepath.c
index 3f7825c..654d03a 100644
--- a/src/filepath.c
+++ b/src/filepath.c
@@ -191,7 +191,8 @@
 	}
 
 	// concat the not-shortened part of the path
-	vim_strncpy(*fname + len, endp, sfx_len);
+	if ((*fname + len) != endp)
+	    vim_strncpy(*fname + len, endp, sfx_len);
 	(*fname)[new_len] = NUL;
     }