diff --git a/spitfire/build.go b/spitfire/build.go
index 929292d..d14b60d 100644
--- a/spitfire/build.go
+++ b/spitfire/build.go
@@ -37,11 +37,6 @@ func SetGlobalEnv(variable, value string, scope string) error {
 
 // Run an external command like scp or rsync
 func runCommand(command string, args ...string) error {
-	// Make sure the MOZILLABUILD environment variable is set for the mach commands
-	if err := setMozillaBuildEnv(); err != nil {
-		return err
-	}
-
 	cmd := exec.Command(command, args...)
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr