diff --git a/Makefile b/Makefile
index 36eb17c..dd8decc 100644
--- a/Makefile
+++ b/Makefile
@@ -3,8 +3,8 @@ CXX=g++15
 CC=gcc15
 TARGET=cudir
 
-CPPFLAGS+= -I /usr/local/include
-CPPFLAGS+= -I.
+CXXFLAGS+= -I /usr/local/include
+CXXFLAGS+= -I.
 
 LD=$(CXX)