diff --git a/modules/src/em_code/em.c b/modules/src/em_code/em.c
index d5db2de4c..cad00d1dd 100644
--- a/modules/src/em_code/em.c
+++ b/modules/src/em_code/em.c
@@ -89,7 +89,7 @@ C_putbyte(c)
 	Xputbyte(c);
 }
 
-#ifdef BIGMACHINE
+#if BIGMACHINE
 #define C_putbyte Xputbyte
 #endif