diff --git a/lib_dec/ivas_mc_param_dec.c b/lib_dec/ivas_mc_param_dec.c
index d4a4fa5168e4cedb5d041ded42303ccd2f40ef30..90dee220315ec1007285d97e5512e9b0d40e99e7 100644
--- a/lib_dec/ivas_mc_param_dec.c
+++ b/lib_dec/ivas_mc_param_dec.c
@@ -1614,6 +1614,17 @@ static void ivas_param_mc_get_mixing_matrices(
 
         matrix_product_diag( mat_mult_buffer1, nY_band, nX, 0, proto_matrix_ptr, nY_band, nX, 1, Cproto_diag );
 
+#ifdef FIX_I220_PARAMMC_CPROTO
+        /* make sure we have no negative entries in Cproto_diag due to rounding errors */
+        for ( ch_idx1 = 0; ch_idx1 < nY_band; ch_idx1++ )
+        {
+            if ( Cproto_diag[ch_idx1] < 0.0f )
+            {
+                Cproto_diag[ch_idx1] = 0.0f;
+            }
+        }
+#endif
+
         /* Computing the mixing matrices */
 
         /* bands with decorr */