diff --git a/hdl/top_corr_matrix.vhd b/hdl/top_corr_matrix.vhd
index b3a40d4b7da594989a6522c1fc2fc23bc6bb2e16..19fc100b1f95b8befa4d57c4f4a49f216556df1d 100644
--- a/hdl/top_corr_matrix.vhd
+++ b/hdl/top_corr_matrix.vhd
@@ -204,7 +204,7 @@ begin
         -- Coef table, desyrdl
         mm_coef_i              => mm_a2l.MATRIXCOEF,
         mm_coef_o              => mm_l2a.MATRIXCOEF,
-        id_cnt_load            => mm_a2l.MM_ID_CNT.data.data,
+        id_cnt_load            => mm_a2l.MM_ID_CNT.data.data(C_W_MM_IDCNT-1 downto 0),
 
         -- Position data in
         pos_x                  => errbpm_x,
diff --git a/rdl/corr_matrix.rdl b/rdl/corr_matrix.rdl
index 88d515dd6abfc44c721740725337ca89d6999697..bb14d356078511c4742aa73add4b29deca808339 100644
--- a/rdl/corr_matrix.rdl
+++ b/rdl/corr_matrix.rdl
@@ -154,7 +154,8 @@ addrmap corr_matrix {
 
     reg {
         desc="Number of ID to count for matrix multiplication.";
-        field {sw = rw; hw = r;} data[`C_W_MM_IDCNT] = `C_N_MM_BPM;
+        desyrdl_data_type="uint16";
+        field {sw = rw; hw = r;} data[16] = `C_N_MM_BPM;
     } MM_ID_CNT;
 
     reg {