diff --git a/src/CLR/Core/CLR_RT_Interop.cpp b/src/CLR/Core/CLR_RT_Interop.cpp
index 1f1e4f1826..7613871cf3 100644
--- a/src/CLR/Core/CLR_RT_Interop.cpp
+++ b/src/CLR/Core/CLR_RT_Interop.cpp
@@ -39,7 +39,7 @@ HRESULT Interop_Marshal_UINT8( const CLR_RT_StackFrame &stackFrame, unsigned int
     NANOCLR_INTEROP_NOCLEANUP();
 }
 
-HRESULT Interop_Marshal_UINT16( const CLR_RT_StackFrame &stackFrame, unsigned int paramIndex, signed short &param )         
+HRESULT Interop_Marshal_UINT16( const CLR_RT_StackFrame &stackFrame, unsigned int paramIndex, unsigned short &param )         
 {
     NATIVE_PROFILE_CLR_CORE();
     NANOCLR_INTEROP_CHECK_ARG_TYPE(DATATYPE_I4)
@@ -47,7 +47,7 @@ HRESULT Interop_Marshal_UINT16( const CLR_RT_StackFrame &stackFrame, unsigned in
     NANOCLR_INTEROP_NOCLEANUP();
 }
 
-HRESULT Interop_Marshal_UINT32( const CLR_RT_StackFrame &stackFrame, unsigned int paramIndex, signed int &param )         
+HRESULT Interop_Marshal_UINT32( const CLR_RT_StackFrame &stackFrame, unsigned int paramIndex, unsigned int &param )         
 {
     NATIVE_PROFILE_CLR_CORE();
     NANOCLR_INTEROP_CHECK_ARG_TYPE(DATATYPE_I4)