diff --git a/src/core/serial.c b/src/core/serial.c
index 897d900b2..29be2216a 100644
--- a/src/core/serial.c
+++ b/src/core/serial.c
@@ -33,7 +33,7 @@
 #endif
 
 #ifndef COMPARITY
-#define COMPARITY	N
+#define COMPARITY	0
 #endif
 
 #ifndef COMSTOP