diff --git a/polymod/hscript/_internal/PolymodInterpEx.hx b/polymod/hscript/_internal/PolymodInterpEx.hx
index 53eb885..7edebe7 100644
--- a/polymod/hscript/_internal/PolymodInterpEx.hx
+++ b/polymod/hscript/_internal/PolymodInterpEx.hx
@@ -51,8 +51,6 @@ class PolymodInterpEx extends Interp
 	{
 		super();
 		_proxy = proxy;
-		variables.set("Math", Math);
-		variables.set("Std", Std);
 		this.targetCls = targetCls;
 	}
 
@@ -219,6 +217,12 @@ class PolymodInterpEx extends Interp
 		}
 	}
 
+	override function resetVariables() {
+		super.resetVariables();
+		variables.set("Math", Math);
+		variables.set("Std", Std);
+	}
+
 	public function clearScriptClassDescriptors():Void {
 		// Clear the script class descriptors.
 		_scriptClassDescriptors.clear();