diff --git a/ssh/common.c b/ssh/common.c
index d5e1d55f..04b341ae 100644
--- a/ssh/common.c
+++ b/ssh/common.c
@@ -840,7 +840,7 @@ bool ssh2_bpp_check_unimplemented(BinaryPacketProtocol *bpp, PktIn *pktin)
 
 #undef BITMAP_UNIVERSAL
 #undef BITMAP_CONDITIONAL
-#undef SSH1_BITMAP_WORD
+#undef SSH2_BITMAP_WORD
 
 /* ----------------------------------------------------------------------
  * Centralised component of SSH host key verification.