diff --git a/src/mbyte.c b/src/mbyte.c
index a27649a..13d3fa6 100644
--- a/src/mbyte.c
+++ b/src/mbyte.c
@@ -5931,7 +5931,7 @@
 		*lenp = (int)(d - retval);
 	    break;
 
-# ifdef MACOS_X
+# ifdef MACOS_CONVERT
 	case CONV_MAC_LATIN1:
 	    retval = mac_string_convert(ptr, len, lenp, vcp->vc_fail,
 					'm', 'l', unconvlenp);