diff --git a/core/HalfLife2.cpp b/core/HalfLife2.cpp
index 50203321..96167126 100644
--- a/core/HalfLife2.cpp
+++ b/core/HalfLife2.cpp
@@ -795,7 +795,7 @@ cell_t CHalfLife2::IndexToReference(int entIndex)
 
 int CHalfLife2::ReferenceToIndex(cell_t entRef)
 {
-	if (entRef == INVALID_EHANDLE_INDEX)
+	if ((unsigned)entRef == INVALID_EHANDLE_INDEX)
 	{
 		return INVALID_EHANDLE_INDEX;
 	}
@@ -841,7 +841,7 @@ cell_t CHalfLife2::EntityToBCompatRef(CBaseEntity *pEntity)
 
 cell_t CHalfLife2::ReferenceToBCompatRef(cell_t entRef)
 {
-	if (entRef == INVALID_EHANDLE_INDEX)
+	if ((unsigned)entRef == INVALID_EHANDLE_INDEX)
 	{
 		return INVALID_EHANDLE_INDEX;
 	}
@@ -860,4 +860,4 @@ cell_t CHalfLife2::ReferenceToBCompatRef(cell_t entRef)
 void *CHalfLife2::GetGlobalEntityList()
 {
 	return g_EntList;
-}
\ No newline at end of file
+}