diff --git a/hdl/hazard3_config.vh b/hdl/hazard3_config.vh
index 04a04d7..d921574 100644
--- a/hdl/hazard3_config.vh
+++ b/hdl/hazard3_config.vh
@@ -61,11 +61,11 @@ parameter EXTENSION_ZBKB      = 0,
 // EXTENSION_ZCB: Support for Zcb basic additional compressed instructions
 // Requires: EXTENSION_C. (Some Zcb instructions also require Zbb or M.)
 // Note Zca is equivalent to C, as we do not support the F extension.
-parameter EXTENSION_ZCB       = 1,
+parameter EXTENSION_ZCB       = 0,
 
 // EXTENSION_ZCMP: Support for Zcmp push/pop instructions.
 // Requires: EXTENSION_C.
-parameter EXTENSION_ZCMP      = 1,
+parameter EXTENSION_ZCMP      = 0,
 
 // EXTENSION_ZIFENCEI: Support for the fence.i instruction
 // Optional, since a plain branch/jump will also flush the prefetch queue.