diff --git a/whisper.cpp b/whisper.cpp
index dcd5ebd..2bed288 100644
--- a/whisper.cpp
+++ b/whisper.cpp
@@ -2899,10 +2899,14 @@ int whisper_lang_auto_detect(
     return whisper_lang_auto_detect_with_state(ctx, ctx->default_state, offset_ms, n_threads, lang_probs);
 }
 
-int whisper_n_len(struct whisper_state * state) {
+int whisper_n_len_from_state(struct whisper_state * state) {
     return state->mel.n_len;
 }
 
+int whisper_n_len(struct whisper_context * ctx) {
+    return ctx->default_state->mel.n_len;
+}
+
 int whisper_n_vocab(struct whisper_context * ctx) {
     return ctx->vocab.n_vocab;
 }
@@ -3655,7 +3659,7 @@ int whisper_full_with_state(
     }
 
     const int seek_start = params.offset_ms/10;
-    const int seek_end = seek_start + (params.duration_ms == 0 ? whisper_n_len(state) : params.duration_ms/10);
+    const int seek_end = seek_start + (params.duration_ms == 0 ? whisper_n_len_from_state(state) : params.duration_ms/10);
 
     // if length of spectrogram is less than 1s (100 samples), then return
     // basically don't process anything that is less than 1s
diff --git a/whisper.h b/whisper.h
index 618dbaf..01506c6 100644
--- a/whisper.h
+++ b/whisper.h
@@ -264,11 +264,12 @@ extern "C" {
                                int   n_threads,
                              float * lang_probs);
 
-    WHISPER_API int whisper_n_len          (struct whisper_context * ctx); // mel length
-    WHISPER_API int whisper_n_vocab        (struct whisper_context * ctx);
-    WHISPER_API int whisper_n_text_ctx     (struct whisper_context * ctx);
-    WHISPER_API int whisper_n_audio_ctx    (struct whisper_context * ctx);
-    WHISPER_API int whisper_is_multilingual(struct whisper_context * ctx);
+    WHISPER_API int whisper_n_len           (struct whisper_context * ctx); // mel length
+    WHISPER_API int whisper_n_len_from_state(struct whisper_state * state); // mel length
+    WHISPER_API int whisper_n_vocab         (struct whisper_context * ctx);
+    WHISPER_API int whisper_n_text_ctx      (struct whisper_context * ctx);
+    WHISPER_API int whisper_n_audio_ctx     (struct whisper_context * ctx);
+    WHISPER_API int whisper_is_multilingual (struct whisper_context * ctx);
 
     // Token logits obtained from the last call to whisper_decode() for the default state
     // The logits for the last token are stored in the last row