diff --git a/otherarch/rwkv_v3.cpp b/otherarch/rwkv_v3.cpp
index 48e0414ed..cbabab5a8 100644
--- a/otherarch/rwkv_v3.cpp
+++ b/otherarch/rwkv_v3.cpp
@@ -304,6 +304,14 @@ struct rwkv_tensor {
     uint8_t * data;
 };
 
+//rwkv relied on the old ggml_nbytes implementation, so backport it here. Fixes breaking change in PR 2874
+size_t rwkv_nbytes_old(const struct ggml_tensor * tensor) {
+    static_assert(GGML_MAX_DIMS == 4, "GGML_MAX_DIMS is not 4 - update this function");
+    auto a = tensor->ne[3]*tensor->nb[3];
+    auto b = (ggml_nelements(tensor)*ggml_type_size(tensor->type))/ggml_blck_size(tensor->type);
+    return ((a) > (b) ? (a) : (b));
+}
+
 bool rwkv_fread_tensor_header(FILE * file, struct rwkv_tensor_header & header) {
     RWKV_ASSERT_FALSE(RWKV_ERROR_FILE_READ, rwkv_fread_data(file, sizeof(struct rwkv_tensor_header) - sizeof(uint32_t), &header));
     header.height = 1;
@@ -371,7 +379,7 @@ bool rwkv_fread_ggml_tensor_data(FILE * file, const struct rwkv_tensor_header &
     RWKV_ASSERT_FALSE_MSG(RWKV_ERROR_ALLOC, tensor, "Failed to allocate tensor");
     ggml_set_name(tensor, name.c_str());
 
-    RWKV_ASSERT_FALSE_MSG(RWKV_ERROR_FILE_READ, rwkv_fread_data(file, ggml_nbytes(tensor), tensor->data), "Failed to read tensor data from %s", name.c_str());
+    RWKV_ASSERT_FALSE_MSG(RWKV_ERROR_FILE_READ, rwkv_fread_data(file, rwkv_nbytes_old(tensor), tensor->data), "Failed to read tensor data from %s", name.c_str());
     return true;
 }
 
@@ -539,7 +547,7 @@ struct rwkv_future_tensor {
         decoy.ne[1] = height;
         decoy.ne[2] = 1;
         decoy.ne[3] = 1;
-        return ggml_nbytes(&decoy);
+        return rwkv_nbytes_old(&decoy);
     }
 
     rwkv_future_tensor() {}
@@ -1595,7 +1603,7 @@ bool rwkv_gpu_offload_layers(struct rwkv_context * ctx, const uint32_t n_layers)
 
 void rwkv_set_inputs(const struct rwkv_context * ctx, const float * state_in) {
     if (state_in) {
-        memcpy(ctx->input_state->data, state_in, ggml_nbytes(ctx->input_state));
+        memcpy(ctx->input_state->data, state_in, rwkv_nbytes_old(ctx->input_state));
     } else {
         rwkv_init_state(ctx, (float *) ctx->input_state->data);
     }
@@ -1603,11 +1611,11 @@ void rwkv_set_inputs(const struct rwkv_context * ctx, const float * state_in) {
 
 void rwkv_get_outputs(const struct rwkv_context * ctx, float * state_out, float * logits_out) {
     if (state_out) {
-        memcpy(state_out, ctx->output_state->data, ggml_nbytes(ctx->output_state));
+        memcpy(state_out, ctx->output_state->data, rwkv_nbytes_old(ctx->output_state));
     }
 
     if (logits_out) {
-        memcpy(logits_out, ctx->logits->data, ggml_nbytes(ctx->logits));
+        memcpy(logits_out, ctx->logits->data, rwkv_nbytes_old(ctx->logits));
     }
 }