diff --git a/public/tier0/memoverride.cpp b/public/tier0/memoverride.cpp
index 41008863..0fcfb6bc 100644
--- a/public/tier0/memoverride.cpp
+++ b/public/tier0/memoverride.cpp
@@ -145,6 +145,11 @@ inline void *ReallocUnattributed( void *pMem, size_t nSize )
 #define FREE_CALL
 #endif
 
+// check for noexcept in crt
+#ifndef _CRT_NOEXCEPT
+#define _CRT_NOEXCEPT
+#endif
+
 extern "C"
 {
 	
@@ -255,7 +260,7 @@ ALLOC_CALL void * __cdecl _recalloc ( void * memblock, size_t count, size_t size
 	return pMem;
 }
 
-size_t _msize_base( void *pMem )
+size_t _msize_base( void *pMem ) _CRT_NOEXCEPT
 {
 	return g_pMemAlloc->GetSize(pMem);
 }