diff --git a/mamba_ssm/ops/selective_scan_interface.py b/mamba_ssm/ops/selective_scan_interface.py
index a41f1359..81799d1d 100644
--- a/mamba_ssm/ops/selective_scan_interface.py
+++ b/mamba_ssm/ops/selective_scan_interface.py
@@ -300,20 +300,6 @@ def backward(ctx, dout):
                 delta = rearrange(delta, "b d l -> (b l) d", l=L).contiguous()
                 delta = rms_norm_forward(delta, ctx.dt_rms_weight, None, ctx.b_c_dt_rms_eps)
                 delta = rearrange(delta, "(b l) d -> b d l", l=L).contiguous()
-            if b_rms_weight is not None:
-                # Recompute & RMSNorm B
-                B = rearrange(B, "b 1 dstate l -> (b l) dstate", l=L).contiguous()
-                B = rms_norm_forward(
-                    B, ctx.b_rms_weight, None, ctx.b_c_dt_rms_eps
-                )
-                B = rearrange(B, "(b l) dstate -> b 1 dstate l", l=L).contiguous()
-            if c_rms_weight is not None:
-                # Recompute & RMSNorm C
-                C = rearrange(C, "b 1 dstate l -> (b l) dstate", l=L).contiguous()
-                C = rms_norm_forward(
-                    C, ctx.c_rms_weight, None, ctx.b_c_dt_rms_eps
-                )
-                C = rearrange(C, "(b l) dstate -> b 1 dstate l", l=L).contiguous()
             
         # The kernel supports passing in a pre-allocated dz (e.g., in case we want to fuse the
         # backward of selective_scan_cuda with the backward of chunk).