diff --git a/core/src/main/java/org/teavm/backend/javascript/codegen/MinifyingAliasProvider.java b/core/src/main/java/org/teavm/backend/javascript/codegen/MinifyingAliasProvider.java
index 32bd6f989..2accfdf91 100644
--- a/core/src/main/java/org/teavm/backend/javascript/codegen/MinifyingAliasProvider.java
+++ b/core/src/main/java/org/teavm/backend/javascript/codegen/MinifyingAliasProvider.java
@@ -49,7 +49,11 @@ public class MinifyingAliasProvider implements AliasProvider {
 
     @Override
     public String getStaticMethodAlias(MethodReference method) {
-        return RenderingUtil.indexToId(lastSuffix++, startLetters);
+        String result;
+        do {
+            result =  RenderingUtil.indexToId(lastSuffix++, startLetters);
+        } while (!usedAliases.add(result) || RenderingUtil.KEYWORDS.contains(result));
+        return result;
     }
 
     @Override