diff --git a/core/src/main/java/org/teavm/backend/javascript/rendering/StatementRenderer.java b/core/src/main/java/org/teavm/backend/javascript/rendering/StatementRenderer.java
index 8b556b302..d2f9c5f53 100644
--- a/core/src/main/java/org/teavm/backend/javascript/rendering/StatementRenderer.java
+++ b/core/src/main/java/org/teavm/backend/javascript/rendering/StatementRenderer.java
@@ -111,6 +111,10 @@ public StatementRenderer(RenderingContext context, SourceWriter writer) {
         this.minifying = context.isMinifying();
         this.naming = context.getNaming();
         this.debugEmitter = context.getDebugEmitter();
+        usedVariableNames.add(context.tempVarName());
+        usedVariableNames.add(context.pointerName());
+        usedVariableNames.add(context.threadName());
+        usedVariableNames.add("arguments");
     }
 
     public boolean isAsync() {