diff --git a/Z80/src/Makefile b/Z80/src/Makefile
index 0916ca7..35ef7e9 100644
--- a/Z80/src/Makefile
+++ b/Z80/src/Makefile
@@ -1,6 +1,6 @@
 LIB = libz80.a
 
-CPPFLAGS = -I ../../inc
+CXXFLAGS = -I ../../inc
 
 CXXFILES = Disassembler.cpp Profiler.cpp Z80.cpp