diff --git a/src/cmd/objdump/main.go b/src/cmd/objdump/main.go
index 708a853702..8bf9e4e306 100644
--- a/src/cmd/objdump/main.go
+++ b/src/cmd/objdump/main.go
@@ -80,7 +80,7 @@ func main() {
 
 	dis, err := f.Disasm()
 	if err != nil {
-		log.Fatal("disassemble %s: %v", flag.Arg(0), err)
+		log.Fatalf("disassemble %s: %v", flag.Arg(0), err)
 	}
 
 	switch flag.NArg() {