diff --git a/HC.make b/HC.make
index 6ac5301..a79acf4 100644
--- a/HC.make
+++ b/HC.make
@@ -8,6 +8,11 @@ ifdef TBSIZE
 CXXFLAGS+=-DVIRTUALTILESIZE=$(TBSIZE)
 endif
 
+ifdef NTILES
+CXXFLAGS+=-DNTILES=$(TBSIZE)
+endif
+
+
 hc-stream: main.cpp HCStream.cpp
 	$(HCC) $(CXXFLAGS) -DHC  $^  $(LDFLAGS) $(EXTRA_FLAGS) -o $@