diff --git a/nel/include/nel/misc/debug.h b/nel/include/nel/misc/debug.h
index 9b6e483768..44036111cb 100644
--- a/nel/include/nel/misc/debug.h
+++ b/nel/include/nel/misc/debug.h
@@ -380,6 +380,13 @@ extern bool _assertex_stop_1(bool &ignoreNextTime);
 #define nlassume(exp) do { } while (0)
 #endif
 
+#if defined(NL_COMP_GCC) && (GCC_VERSION >= 40500)
+// This may evaluate the expression at runtime if it has side effects, so it is not a desirable nlassume implementation in release mode
+#define nlassumeex(exp) do { if (!(exp)) __builtin_unreachable(); } while (0)
+#else
+#define nlassumeex(exp) nlassume(exp)
+#endif
+
 #ifdef NL_NO_DEBUG
 #	define nlassert(exp) nlassume(exp)
 #	define nlassertonce(exp) nlassume(exp)
diff --git a/nel/include/nel/misc/smart_ptr_inline.h b/nel/include/nel/misc/smart_ptr_inline.h
index 1e950d710d..35cc61aacc 100644
--- a/nel/include/nel/misc/smart_ptr_inline.h
+++ b/nel/include/nel/misc/smart_ptr_inline.h
@@ -130,6 +130,8 @@ SMART_INLINE void	CRefPtr<T>::unRef() const
 		}
 		else
 		{
+			// Guarantueed by !pinfo->IsNullPtrInfo
+			nlassumeex(pinfo != &CRefCount::NullPtrInfo);
 			// If the CRefPtr still point to a valid object.
 			if(pinfo->Ptr)
 			{