diff --git a/misc/dashboard/builder/main.go b/misc/dashboard/builder/main.go
index bce930d4028..1ba8e579e50 100644
--- a/misc/dashboard/builder/main.go
+++ b/misc/dashboard/builder/main.go
@@ -478,6 +478,7 @@ func (b *Builder) envv() []string {
 		"GOOS=" + b.goos,
 		"GOARCH=" + b.goarch,
 		"GOROOT_FINAL=/usr/local/go",
+		"GOBUILDEXIT=1", // On Windows, exit all.bat with completion status.
 	}
 	for _, k := range extraEnv {
 		s, err := os.Getenverror(k)
diff --git a/src/all.bat b/src/all.bat
index feaf4e65dfd..4389a528d21 100644
--- a/src/all.bat
+++ b/src/all.bat
@@ -16,4 +16,4 @@ if %GOBUILDFAIL%==1 goto end
 ..\bin\tool\dist banner
 
 :end
-exit %GOBUILDFAIL%
+if x%GOBUILDEXIT%==x1 exit %GOBUILDFAIL%