diff --git a/examples/bench.wasm/emscripten.cpp b/examples/bench.wasm/emscripten.cpp
index cc761485..083397db 100644
--- a/examples/bench.wasm/emscripten.cpp
+++ b/examples/bench.wasm/emscripten.cpp
@@ -23,9 +23,9 @@ void bench_main(size_t index) {
 
     fprintf(stderr, "%s: running benchmark with %d threads - please wait...\n", __func__, n_threads);
 
-    const int n_mel = 80;
+    const int n_mels = whisper_model_n_mels(ctx);
 
-    if (int ret = whisper_set_mel(ctx, nullptr, 0, n_mel)) {
+    if (int ret = whisper_set_mel(ctx, nullptr, 0, n_mels)) {
         fprintf(stderr, "error: failed to set mel: %d\n", ret);
         return;
     }
diff --git a/examples/bench/bench.cpp b/examples/bench/bench.cpp
index a16c0f7f..db1c4e80 100644
--- a/examples/bench/bench.cpp
+++ b/examples/bench/bench.cpp
@@ -73,9 +73,9 @@ int whisper_bench_full(const whisper_params & params) {
         return 2;
     }
 
-    const int n_mel = 80;
+    const int n_mels = whisper_model_n_mels(ctx);
 
-    if (int ret = whisper_set_mel(ctx, nullptr, 0, n_mel)) {
+    if (int ret = whisper_set_mel(ctx, nullptr, 0, n_mels)) {
         fprintf(stderr, "error: failed to set mel: %d\n", ret);
         return 3;
     }