diff --git a/src/CLR/Core/CLR_RT_StackFrame.cpp b/src/CLR/Core/CLR_RT_StackFrame.cpp
index 59c861892d..a2eb9ea960 100644
--- a/src/CLR/Core/CLR_RT_StackFrame.cpp
+++ b/src/CLR/Core/CLR_RT_StackFrame.cpp
@@ -719,7 +719,10 @@ HRESULT CLR_RT_StackFrame::FixCall()
                     }
                     else if (args->Dereference()->ObjectCls().m_data == res.m_cls.m_data)
                     {
-                        NANOCLR_CHECK_HRESULT(args->PerformUnboxing(inst));
+                        if (args->Dereference()->IsBoxed())
+                        {
+                            NANOCLR_CHECK_HRESULT(args->PerformUnboxing(inst));
+                        }
                     }
                     else
                     {