diff --git a/teavm-core/src/main/java/org/teavm/javascript/Renderer.java b/teavm-core/src/main/java/org/teavm/javascript/Renderer.java
index 57827593e..4afc63436 100644
--- a/teavm-core/src/main/java/org/teavm/javascript/Renderer.java
+++ b/teavm-core/src/main/java/org/teavm/javascript/Renderer.java
@@ -55,6 +55,7 @@ public class Renderer implements ExprVisitor, StatementVisitor, RenderingContext
     private DeferredCallSite lastCallSite;
     private DeferredCallSite prevCallSite;
     private Set<MethodReference> asyncMethods;
+    private Set<MethodReference> asyncFamilyMethods;
     private Diagnostics diagnostics;
     private boolean async;
 
@@ -79,13 +80,15 @@ public class Renderer implements ExprVisitor, StatementVisitor, RenderingContext
     }
 
     public Renderer(SourceWriter writer, ListableClassHolderSource classSource, ClassLoader classLoader,
-            ServiceRepository services, Set<MethodReference> asyncMethods, Diagnostics diagnostics) {
+            ServiceRepository services, Set<MethodReference> asyncMethods, Set<MethodReference> asyncFamilyMethods,
+            Diagnostics diagnostics) {
         this.naming = writer.getNaming();
         this.writer = writer;
         this.classSource = classSource;
         this.classLoader = classLoader;
         this.services = services;
         this.asyncMethods = new HashSet<>(asyncMethods);
+        this.asyncFamilyMethods = new HashSet<>(asyncFamilyMethods);
         this.diagnostics = diagnostics;
     }
 
@@ -460,7 +463,7 @@ public class Renderer implements ExprVisitor, StatementVisitor, RenderingContext
             writer.append(");").ws().append("}");
             debugEmitter.emitMethod(null);
 
-            if (!method.isAsync()) {
+            if (!method.isAsync() && asyncFamilyMethods.contains(method.getReference())) {
                 writer.append(",").newLine();
                 writer.append("\"").append(naming.getNameForAsync(ref)).append("\",").ws();
                 writer.append("$rt_asyncAdapter(").appendMethodBody(ref).append(')');
diff --git a/teavm-core/src/main/java/org/teavm/model/util/AsyncMethodFinder.java b/teavm-core/src/main/java/org/teavm/model/util/AsyncMethodFinder.java
index 75dbb481b..78f89b64c 100644
--- a/teavm-core/src/main/java/org/teavm/model/util/AsyncMethodFinder.java
+++ b/teavm-core/src/main/java/org/teavm/model/util/AsyncMethodFinder.java
@@ -15,8 +15,7 @@
  */
 package org.teavm.model.util;
 
-import java.util.HashSet;
-import java.util.Set;
+import java.util.*;
 import org.teavm.callgraph.CallGraph;
 import org.teavm.callgraph.CallGraphNode;
 import org.teavm.callgraph.CallSite;
@@ -32,6 +31,9 @@ import org.teavm.model.*;
  */
 public class AsyncMethodFinder {
     private Set<MethodReference> asyncMethods = new HashSet<>();
+    private Map<MethodReference, Boolean> asyncFamilyMethods = new HashMap<>();
+    private Set<MethodReference> readonlyAsyncMethods = Collections.unmodifiableSet(asyncMethods);
+    private Set<MethodReference> readonlyAsyncFamilyMethods = Collections.unmodifiableSet(asyncFamilyMethods.keySet());
     private CallGraph callGraph;
     private Diagnostics diagnostics;
     private ListableClassReaderSource classSource;
@@ -42,7 +44,11 @@ public class AsyncMethodFinder {
     }
 
     public Set<MethodReference> getAsyncMethods() {
-        return asyncMethods;
+        return readonlyAsyncMethods;
+    }
+
+    public Set<MethodReference> getAsyncFamilyMethods() {
+        return readonlyAsyncFamilyMethods;
     }
 
     public void find(ListableClassReaderSource classSource) {
@@ -58,6 +64,17 @@ public class AsyncMethodFinder {
                 }
             }
         }
+        for (String clsName : classSource.getClassNames()) {
+            ClassReader cls = classSource.get(clsName);
+            for (MethodReader method : cls.getMethods()) {
+                addToFamily(method.getReference());
+            }
+        }
+        for (Map.Entry<MethodReference, Boolean> entry : new ArrayList<>(asyncFamilyMethods.entrySet())) {
+            if (!entry.getValue()) {
+                asyncFamilyMethods.remove(entry.getKey());
+            }
+        }
     }
 
     private void add(MethodReference methodRef) {
@@ -98,6 +115,44 @@ public class AsyncMethodFinder {
         }
     }
 
+    private boolean addToFamily(MethodReference methodRef) {
+        Boolean cachedResult = asyncFamilyMethods.get(methodRef);
+        if (cachedResult != null) {
+            return cachedResult;
+        }
+        boolean result = addToFamilyCacheMiss(methodRef);
+        asyncFamilyMethods.put(methodRef, result);
+        return result;
+    }
+
+    private boolean addToFamilyCacheMiss(MethodReference methodRef) {
+        if (asyncMethods.contains(methodRef)) {
+            return true;
+        }
+        ClassReader cls = classSource.get(methodRef.getClassName());
+        if (cls == null) {
+            return false;
+        }
+        List<String> parents = new ArrayList<>();
+        if (cls.getParent() != null && !cls.getParent().equals(cls.getName())) {
+            parents.add(cls.getParent());
+        }
+        parents.addAll(cls.getInterfaces());
+
+        Set<MethodReference> visited = new HashSet<>();
+        Set<MethodReference> overriden = new HashSet<>();
+        for (String parent : parents) {
+            findOverridenMethods(new MethodReference(parent, methodRef.getDescriptor()), overriden, visited);
+        }
+
+        for (MethodReference overridenMethod : overriden) {
+            if (addToFamily(overridenMethod)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     private void findOverridenMethods(MethodReference methodRef, Set<MethodReference> result,
             Set<MethodReference> visited) {
         if (!visited.add(methodRef)) {
diff --git a/teavm-core/src/main/java/org/teavm/vm/TeaVM.java b/teavm-core/src/main/java/org/teavm/vm/TeaVM.java
index e964c15b3..435603082 100644
--- a/teavm-core/src/main/java/org/teavm/vm/TeaVM.java
+++ b/teavm-core/src/main/java/org/teavm/vm/TeaVM.java
@@ -90,6 +90,7 @@ public class TeaVM implements TeaVMHost, ServiceRepository {
     private boolean cancelled;
     private ListableClassHolderSource writtenClasses;
     private Set<MethodReference> asyncMethods = new HashSet<>();
+    private Set<MethodReference> asyncFamilyMethods = new HashSet<>();
 
     TeaVM(ClassReaderSource classSource, ClassLoader classLoader) {
         this.classSource = classSource;
@@ -397,7 +398,8 @@ public class TeaVM implements TeaVMHost, ServiceRepository {
         SourceWriterBuilder builder = new SourceWriterBuilder(naming);
         builder.setMinified(minifying);
         SourceWriter sourceWriter = builder.build(writer);
-        Renderer renderer = new Renderer(sourceWriter, classSet, classLoader, this, asyncMethods, diagnostics);
+        Renderer renderer = new Renderer(sourceWriter, classSet, classLoader, this, asyncMethods, asyncFamilyMethods,
+                diagnostics);
         renderer.setProperties(properties);
         if (debugEmitter != null) {
             int classIndex = 0;
@@ -539,6 +541,7 @@ public class TeaVM implements TeaVMHost, ServiceRepository {
         AsyncMethodFinder asyncFinder = new AsyncMethodFinder(dependencyChecker.getCallGraph(), diagnostics);
         asyncFinder.find(classes);
         asyncMethods.addAll(asyncFinder.getAsyncMethods());
+        asyncFamilyMethods.addAll(asyncFinder.getAsyncFamilyMethods());
 
         progressListener.phaseStarted(TeaVMPhase.DECOMPILATION, classes.getClassNames().size());
         Decompiler decompiler = new Decompiler(classes, classLoader, asyncFinder.getAsyncMethods());
diff --git a/teavm-core/src/main/resources/org/teavm/javascript/runtime.js b/teavm-core/src/main/resources/org/teavm/javascript/runtime.js
index 638b4db73..ec07f8bfa 100644
--- a/teavm-core/src/main/resources/org/teavm/javascript/runtime.js
+++ b/teavm-core/src/main/resources/org/teavm/javascript/runtime.js
@@ -412,7 +412,6 @@ function $rt_asyncError(e) {
 }
 function $rt_asyncAdapter(f) {
     return function() {
-        var e;
         var result;
         var args = Array.prototype.slice.apply(arguments);
         var $return = args.pop();
diff --git a/teavm-samples/teavm-samples-benchmark/pom.xml b/teavm-samples/teavm-samples-benchmark/pom.xml
index 711bcca06..bbf7e22d0 100644
--- a/teavm-samples/teavm-samples-benchmark/pom.xml
+++ b/teavm-samples/teavm-samples-benchmark/pom.xml
@@ -91,7 +91,7 @@
               <targetDirectory>${project.build.directory}/generated/js/teavm</targetDirectory>
               <mainClass>org.teavm.samples.benchmark.teavm.BenchmarkStarter</mainClass>
               <runtime>SEPARATE</runtime>
-              <minifying>false</minifying>
+              <minifying>true</minifying>
               <debugInformationGenerated>true</debugInformationGenerated>
             </configuration>
           </execution>