diff --git a/janino/src/main/java/org/codehaus/janino/UnitCompiler.java b/janino/src/main/java/org/codehaus/janino/UnitCompiler.java
index 1034124d4..6d99b1adc 100644
--- a/janino/src/main/java/org/codehaus/janino/UnitCompiler.java
+++ b/janino/src/main/java/org/codehaus/janino/UnitCompiler.java
@@ -10875,6 +10875,8 @@ interface Compilable { void compile() throws CompileException; }
                 }
                 if (this.isWideningReferenceConvertible(boxedType, targetType)) {
                     this.boxingConversion(locatable, sourceType, boxedType);
+                    this.getCodeContext().popOperand(boxedType.getDescriptor());
+                    this.getCodeContext().pushOperand(targetType.getDescriptor());
                     return true;
                 }
             }