diff --git a/vpi/Makefile b/vpi/Makefile
index 9150f2539..dc2fa0250 100644
--- a/vpi/Makefile
+++ b/vpi/Makefile
@@ -1,6 +1,5 @@
-CC=clang
 INSTDIR=/usr/lib/ivl
-INCDIRS=
+INCDIRS=-I/usr/include/iverilog
 
 OBJ=ipc.o main.o