diff --git a/PDP18B/pdp18b_g2.c b/PDP18B/pdp18b_g2tty.c
similarity index 100%
rename from PDP18B/pdp18b_g2.c
rename to PDP18B/pdp18b_g2tty.c
diff --git a/makefile b/makefile
index 6ff7fb5d..a249f676 100644
--- a/makefile
+++ b/makefile
@@ -940,7 +940,7 @@ PDP18B = ${PDP18BD}/pdp18b_dt.c ${PDP18BD}/pdp18b_drm.c ${PDP18BD}/pdp18b_cpu.c
 	${PDP18BD}/pdp18b_lp.c ${PDP18BD}/pdp18b_mt.c ${PDP18BD}/pdp18b_rf.c \
 	${PDP18BD}/pdp18b_rp.c ${PDP18BD}/pdp18b_stddev.c ${PDP18BD}/pdp18b_sys.c \
 	${PDP18BD}/pdp18b_rb.c ${PDP18BD}/pdp18b_tt1.c ${PDP18BD}/pdp18b_fpp.c \
-	${PDP18BD}/pdp18b_g2.c
+	${PDP18BD}/pdp18b_g2tty.c
 
 PDP4_OPT = -DPDP4 -I ${PDP18BD}
 PDP7_OPT = -DPDP7 -I ${PDP18BD}