diff --git a/PCbuild/rt.bat b/PCbuild/rt.bat
index cd32a386f03..33f4212e145 100644
--- a/PCbuild/rt.bat
+++ b/PCbuild/rt.bat
@@ -32,7 +32,7 @@ set pcbuild=%~dp0
 set suffix=
 set qmode=
 set dashO=
-set regrtestargs--fail-env-changed --fail-rerun
+set regrtestargs=--fail-env-changed --fail-rerun
 set exe=
 
 :CheckOpts