diff --git a/src/main/java/com/caoccao/javet/buddy/ts2java/ast/Ts2JavaAstBinExpr.java b/src/main/java/com/caoccao/javet/buddy/ts2java/ast/Ts2JavaAstBinExpr.java
index e1ded1b..8b70c43 100644
--- a/src/main/java/com/caoccao/javet/buddy/ts2java/ast/Ts2JavaAstBinExpr.java
+++ b/src/main/java/com/caoccao/javet/buddy/ts2java/ast/Ts2JavaAstBinExpr.java
@@ -21,6 +21,7 @@
 import com.caoccao.javet.buddy.ts2java.compiler.JavaFunctionContext;
 import com.caoccao.javet.swc4j.ast.expr.Swc4jAstBinExpr;
 import com.caoccao.javet.swc4j.ast.expr.Swc4jAstIdent;
+import com.caoccao.javet.swc4j.ast.interfaces.ISwc4jAstExpr;
 import com.caoccao.javet.utils.SimpleFreeMarkerFormat;
 import com.caoccao.javet.utils.SimpleMap;
 import net.bytebuddy.implementation.Implementation;
@@ -28,26 +29,25 @@
 import net.bytebuddy.jar.asm.MethodVisitor;
 import net.bytebuddy.jar.asm.Opcodes;
 
-import java.util.stream.Stream;
-
 public final class Ts2JavaAstBinExpr implements ITs2JavaAstStackManipulation<Swc4jAstBinExpr> {
     @Override
     public void manipulate(JavaFunctionContext functionContext, Swc4jAstBinExpr ast) {
         StackManipulation stackManipulation = new StackManipulation.Simple((
                 MethodVisitor methodVisitor,
                 Implementation.Context implementationContext) -> {
-            Stream.of(ast.getLeft(), ast.getRight()).forEach(expr -> {
+            int stackSize = 0;
+            for (ISwc4jAstExpr expr : new ISwc4jAstExpr[]{ast.getLeft(), ast.getRight()}) {
                 switch (expr.getType()) {
                     case Ident:
                         String name = Ts2JavaAstIdent.getSym(expr.as(Swc4jAstIdent.class));
-                        JavaByteCodeOpLoad.generateByteCode(functionContext, name, methodVisitor);
+                        stackSize += JavaByteCodeOpLoad.generate(functionContext, name, methodVisitor);
                         break;
                     default:
                         throw new Ts2JavaException(
                                 SimpleFreeMarkerFormat.format("BinExpr expr type ${exprType} is not supported",
                                         SimpleMap.of("exprType", expr.getType().name())));
                 }
-            });
+            }
             switch (ast.getOp()) {
                 case Add:
                     methodVisitor.visitInsn(Opcodes.IADD);
@@ -57,7 +57,7 @@ public void manipulate(JavaFunctionContext functionContext, Swc4jAstBinExpr ast)
                             SimpleFreeMarkerFormat.format("BinExpr op ${op} is not supported",
                                     SimpleMap.of("op", ast.getOp().name())));
             }
-            return new StackManipulation.Size(2, 0);
+            return new StackManipulation.Size(stackSize, 0);
         });
         functionContext.getStackManipulations().add(stackManipulation);
     }
diff --git a/src/main/java/com/caoccao/javet/buddy/ts2java/compiler/JavaByteCodeOpLoad.java b/src/main/java/com/caoccao/javet/buddy/ts2java/compiler/JavaByteCodeOpLoad.java
index f22f585..ef016c6 100644
--- a/src/main/java/com/caoccao/javet/buddy/ts2java/compiler/JavaByteCodeOpLoad.java
+++ b/src/main/java/com/caoccao/javet/buddy/ts2java/compiler/JavaByteCodeOpLoad.java
@@ -42,7 +42,7 @@ public final class JavaByteCodeOpLoad {
     private JavaByteCodeOpLoad() {
     }
 
-    public static void generateByteCode(JavaFunctionContext functionContext, String name, MethodVisitor methodVisitor) {
+    public static int generate(JavaFunctionContext functionContext, String name, MethodVisitor methodVisitor) {
         final int size = functionContext.getStackFrames().size();
         JavaStackObject stackObject = null;
         int stackFrameIndex = 0;
@@ -62,5 +62,6 @@ public static void generateByteCode(JavaFunctionContext functionContext, String
         int stackDepth = functionContext.getStackDepth(stackFrameIndex - 1);
         int index = stackDepth + stackObject.getIndex() + 1;
         methodVisitor.visitVarInsn(opCode, index);
+        return 1;
     }
 }