diff --git a/libsrc/apple2/detect80cols.s b/libsrc/apple2/detect80cols.s
index 19e6fda74..c6f263566 100644
--- a/libsrc/apple2/detect80cols.s
+++ b/libsrc/apple2/detect80cols.s
@@ -39,7 +39,7 @@ IdTableLen      = * - IdValTable
 
 detect80cols:
         .ifndef __APPLE2ENH__
-        lda     machinetype     ; Check we're on a //e at least, otherwise we
+        bit     machinetype     ; Check we're on a //e at least, otherwise we
         bpl     NoDev           ; handle no 80cols hardware (like Videx)
         .endif