diff --git a/src/main/java/org/jd/core/v1/model/javasyntax/expression/PreOperatorExpression.java b/src/main/java/org/jd/core/v1/model/javasyntax/expression/PreOperatorExpression.java
index 70e0ea3..2c414ae 100644
--- a/src/main/java/org/jd/core/v1/model/javasyntax/expression/PreOperatorExpression.java
+++ b/src/main/java/org/jd/core/v1/model/javasyntax/expression/PreOperatorExpression.java
@@ -16,7 +16,7 @@ public class PreOperatorExpression extends AbstractLineNumberExpression {
     public PreOperatorExpression(int lineNumber, String operator, Expression expression) {
         super(lineNumber);
         this.operator = operator;
-        this.expression = expression;
+        this.setExpression(expression);
     }
 
     @Override
diff --git a/src/test/java/org/jd/core/v1/model/javasyntax/expression/PreOperatorExpressionTest.java b/src/test/java/org/jd/core/v1/model/javasyntax/expression/PreOperatorExpressionTest.java
new file mode 100644
index 0000000..db485ee
--- /dev/null
+++ b/src/test/java/org/jd/core/v1/model/javasyntax/expression/PreOperatorExpressionTest.java
@@ -0,0 +1,49 @@
+package org.jd.core.v1.model.javasyntax.expression;
+
+import org.jd.core.v1.model.javasyntax.type.PrimitiveType;
+import org.jd.core.v1.model.javasyntax.type.Type;
+import org.jd.core.v1.service.converter.classfiletojavasyntax.visitor.TestVisitor;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+public class PreOperatorExpressionTest {
+
+    @Test
+    public void testPreOperatorExpression() {
+        Expression expression = new IntegerConstantExpression(10, PrimitiveType.TYPE_INT, 5);
+        String operator = "++";
+        PreOperatorExpression preOperatorExpression = new PreOperatorExpression(10, operator, expression);
+
+        // Test getOperator
+        assertEquals(operator, preOperatorExpression.getOperator());
+
+        // Test getExpression
+        assertEquals(expression, preOperatorExpression.getExpression());
+
+        // Test getType
+        Type expectedType = PrimitiveType.TYPE_INT;
+        assertEquals(expectedType, preOperatorExpression.getType());
+
+        // Test getPriority
+        assertEquals(2, preOperatorExpression.getPriority());
+
+        // Test isPreOperatorExpression
+        assertTrue(preOperatorExpression.isPreOperatorExpression());
+
+        // Test toString
+        assertEquals("PreOperatorExpression{++ IntegerConstantExpression{type=PrimitiveType{primitive=int}, value=5}}", preOperatorExpression.toString());
+
+        // Test copyTo
+        PreOperatorExpression copiedExpression = (PreOperatorExpression) preOperatorExpression.copyTo(20);
+        assertEquals(preOperatorExpression.getOperator(), copiedExpression.getOperator());
+        assertEquals(preOperatorExpression.getExpression(), copiedExpression.getExpression());
+        assertEquals(20, copiedExpression.getLineNumber());
+
+        // Test the accept method with a simple visitor
+        TestVisitor visitor = new TestVisitor();
+        copiedExpression.accept(visitor);
+        assertEquals(1, visitor.getPreOperatorExpressionCount());
+    }
+}