diff --git a/rdl/corr_matrix.rdl b/rdl/corr_matrix.rdl
index bb14d356078511c4742aa73add4b29deca808339..866206bc7945aee16fa1e8a757b303e0750d3ee9 100644
--- a/rdl/corr_matrix.rdl
+++ b/rdl/corr_matrix.rdl
@@ -155,7 +155,7 @@ addrmap corr_matrix {
     reg {
         desc="Number of ID to count for matrix multiplication.";
         desyrdl_data_type="uint16";
-        field {sw = rw; hw = r;} data[16] = `C_N_MM_BPM;
+        field {sw = rw; hw = r;} data[16];
     } MM_ID_CNT;
 
     reg {