diff --git a/src/cmd/asm/internal/flags/flags.go b/src/cmd/asm/internal/flags/flags.go
index 95575e15a3f..fad87b221a8 100644
--- a/src/cmd/asm/internal/flags/flags.go
+++ b/src/cmd/asm/internal/flags/flags.go
@@ -23,7 +23,7 @@ var (
 	Dynlink    = flag.Bool("dynlink", false, "support references to Go symbols defined in other shared libraries")
 	AllErrors  = flag.Bool("e", false, "no limit on number of errors reported")
 	SymABIs    = flag.Bool("gensymabis", false, "write symbol ABI information to output file, don't assemble")
-	Newobj     = flag.Bool("newobj", true, "use new object file format")
+	Newobj     = flag.Bool("newobj", false, "use new object file format")
 )
 
 var (
diff --git a/src/cmd/compile/internal/gc/main.go b/src/cmd/compile/internal/gc/main.go
index 4684dfb88f2..ed8cfeb40fb 100644
--- a/src/cmd/compile/internal/gc/main.go
+++ b/src/cmd/compile/internal/gc/main.go
@@ -273,7 +273,7 @@ func Main(archInit func(*Arch)) {
 	flag.StringVar(&benchfile, "bench", "", "append benchmark times to `file`")
 	flag.BoolVar(&smallFrames, "smallframes", false, "reduce the size limit for stack allocated objects")
 	flag.BoolVar(&Ctxt.UseBASEntries, "dwarfbasentries", Ctxt.UseBASEntries, "use base address selection entries in DWARF")
-	flag.BoolVar(&Ctxt.Flag_newobj, "newobj", true, "use new object file format")
+	flag.BoolVar(&Ctxt.Flag_newobj, "newobj", false, "use new object file format")
 
 	objabi.Flagparse(usage)
 
diff --git a/src/cmd/link/internal/ld/main.go b/src/cmd/link/internal/ld/main.go
index 10717f603d6..e42705e3ef6 100644
--- a/src/cmd/link/internal/ld/main.go
+++ b/src/cmd/link/internal/ld/main.go
@@ -86,7 +86,7 @@ var (
 	flagInterpreter = flag.String("I", "", "use `linker` as ELF dynamic linker")
 	FlagDebugTramp  = flag.Int("debugtramp", 0, "debug trampolines")
 	FlagStrictDups  = flag.Int("strictdups", 0, "sanity check duplicate symbol contents during object file reading (1=warn 2=err).")
-	flagNewobj      = flag.Bool("newobj", true, "use new object file format")
+	flagNewobj      = flag.Bool("newobj", false, "use new object file format")
 
 	FlagRound       = flag.Int("R", -1, "set address rounding `quantum`")
 	FlagTextAddr    = flag.Int64("T", -1, "set text segment `address`")