diff --git a/core/src/main/java/org/teavm/backend/lowlevel/transform/CoroutineTransformation.java b/core/src/main/java/org/teavm/backend/lowlevel/transform/CoroutineTransformation.java
index 3f70d46b7..0ba70c232 100644
--- a/core/src/main/java/org/teavm/backend/lowlevel/transform/CoroutineTransformation.java
+++ b/core/src/main/java/org/teavm/backend/lowlevel/transform/CoroutineTransformation.java
@@ -126,6 +126,7 @@ public class CoroutineTransformation {
         splitter.fixProgram();
         processIrreducibleCfg();
         RedundantJumpElimination.optimize(program);
+        new PhiUpdater().updatePhis(program, parameterCount + 1);
     }
 
     private void createSplitPrologue() {
@@ -479,7 +480,6 @@ public class CoroutineTransformation {
             weights[i] = program.basicBlockAt(i).instructionCount();
         }
         GraphUtils.splitIrreducibleGraph(graph, weights, splittingBackend);
-        new PhiUpdater().updatePhis(program, parameterCount + 1);
     }
 
     class SplittingBackend implements GraphSplittingBackend {
diff --git a/core/src/main/java/org/teavm/backend/wasm/WasmTarget.java b/core/src/main/java/org/teavm/backend/wasm/WasmTarget.java
index b95820650..40526d592 100644
--- a/core/src/main/java/org/teavm/backend/wasm/WasmTarget.java
+++ b/core/src/main/java/org/teavm/backend/wasm/WasmTarget.java
@@ -1114,7 +1114,7 @@ public class WasmTarget implements TeaVMTarget, TeaVMWasmHost {
 
     @Override
     public boolean isAsyncSupported() {
-        return false;
+        return true;
     }
 
     @Override
diff --git a/core/src/main/java/org/teavm/backend/wasm/intrinsics/PlatformIntrinsic.java b/core/src/main/java/org/teavm/backend/wasm/intrinsics/PlatformIntrinsic.java
index 826a173a3..ae7826cc1 100644
--- a/core/src/main/java/org/teavm/backend/wasm/intrinsics/PlatformIntrinsic.java
+++ b/core/src/main/java/org/teavm/backend/wasm/intrinsics/PlatformIntrinsic.java
@@ -17,7 +17,6 @@ package org.teavm.backend.wasm.intrinsics;
 
 import org.teavm.ast.InvocationExpr;
 import org.teavm.backend.wasm.model.expression.WasmExpression;
-import org.teavm.backend.wasm.model.expression.WasmInt32Constant;
 import org.teavm.model.MethodDescriptor;
 import org.teavm.model.MethodReference;
 
@@ -34,7 +33,6 @@ public class PlatformIntrinsic implements WasmIntrinsic {
         switch (methodDescriptor.getName()) {
             case "getPlatformObject":
             case "asJavaClass":
-            case "createQueue":
                 return true;
             default:
                 return false;
@@ -47,8 +45,6 @@ public class PlatformIntrinsic implements WasmIntrinsic {
             case "getPlatformObject":
             case "asJavaClass":
                 return manager.generate(invocation.getArguments().get(0));
-            case "createQueue":
-                return new WasmInt32Constant(0);
             default:
                 throw new IllegalArgumentException(invocation.getMethod().toString());
         }
diff --git a/core/src/main/resources/org/teavm/backend/wasm/wasm-runtime.js b/core/src/main/resources/org/teavm/backend/wasm/wasm-runtime.js
index dac22a5f6..c3ea3b587 100644
--- a/core/src/main/resources/org/teavm/backend/wasm/wasm-runtime.js
+++ b/core/src/main/resources/org/teavm/backend/wasm/wasm-runtime.js
@@ -88,7 +88,7 @@ TeaVM.wasm = function() {
             }
         }
         if (result >= 0) {
-            controller.timer = setTimeout(() => process(controller), result)
+            controller.timer = setTimeout(() => process(controller), Number(result))
         }
     }