diff --git a/usr.bin/uudecode/uudecode.c b/usr.bin/uudecode/uudecode.c
index 17de5376b256..e4813535fa85 100644
--- a/usr.bin/uudecode/uudecode.c
+++ b/usr.bin/uudecode/uudecode.c
@@ -172,7 +172,7 @@ decode()
 				}
 			}
 	}
-	if (!fgets(buf, sizeof(buf), stdin) || strcmp(buf, "end") || (buf[3] && buf[3] != '\n')) {
+	if (!fgets(buf, sizeof(buf), stdin) || strncmp(buf, "end", 3) || (buf[3] && buf[3] != '\n')) {
 		(void)fprintf(stderr, "uudecode: %s: no \"end\" line.\n",
 		    filename);
 		return(1);