diff --git a/teavm-core/src/main/java/org/teavm/javascript/Decompiler.java b/teavm-core/src/main/java/org/teavm/javascript/Decompiler.java
index 6b4a24a19..0f3fb7a5b 100644
--- a/teavm-core/src/main/java/org/teavm/javascript/Decompiler.java
+++ b/teavm-core/src/main/java/org/teavm/javascript/Decompiler.java
@@ -212,7 +212,7 @@ public class Decompiler {
             node.getVariables().add(program.variableAt(i).getRegister());
         }
         Optimizer optimizer = new Optimizer();
-        optimizer.optimize(node, program);
+        optimizer.optimize(node, splitter);
         node.getModifiers().addAll(mapModifiers(method.getModifiers()));
         int paramCount = Math.min(method.getSignature().length, program.variableCount());
         for (int i = 0; i < paramCount; ++i) {
diff --git a/teavm-core/src/main/java/org/teavm/javascript/Optimizer.java b/teavm-core/src/main/java/org/teavm/javascript/Optimizer.java
index e32c26b37..4c7e18804 100644
--- a/teavm-core/src/main/java/org/teavm/javascript/Optimizer.java
+++ b/teavm-core/src/main/java/org/teavm/javascript/Optimizer.java
@@ -19,6 +19,7 @@ import org.teavm.javascript.ast.AsyncMethodNode;
 import org.teavm.javascript.ast.AsyncMethodPart;
 import org.teavm.javascript.ast.RegularMethodNode;
 import org.teavm.model.Program;
+import org.teavm.model.util.AsyncProgramSplitter;
 
 /**
  *
@@ -42,9 +43,11 @@ public class Optimizer {
         }
     }
 
-    public void optimize(AsyncMethodNode method, Program program) {
+    public void optimize(AsyncMethodNode method, AsyncProgramSplitter splitter) {
         ReadWriteStatsBuilder stats = new ReadWriteStatsBuilder(method.getVariables().size());
-        stats.analyze(program);
+        for (int i = 0; i < splitter.size(); ++i) {
+            stats.analyze(splitter.getProgram(i));
+        }
         for (AsyncMethodPart part : method.getBody()) {
             OptimizingVisitor optimizer = new OptimizingVisitor(stats.copy());
             part.getStatement().acceptVisitor(optimizer);