diff --git a/examples/whisper.android/lib/src/main/jni/whisper/jni.c b/examples/whisper.android/lib/src/main/jni/whisper/jni.c
index 08825ed94..7f9d72461 100644
--- a/examples/whisper.android/lib/src/main/jni/whisper/jni.c
+++ b/examples/whisper.android/lib/src/main/jni/whisper/jni.c
@@ -228,6 +228,7 @@ Java_com_whispercpp_whisper_WhisperLib_00024Companion_benchMemcpy(JNIEnv *env, j
     UNUSED(thiz);
     const char *bench_ggml_memcpy = whisper_bench_memcpy_str(n_threads);
     jstring string = (*env)->NewStringUTF(env, bench_ggml_memcpy);
+    return string;
 }
 
 JNIEXPORT jstring JNICALL
@@ -236,4 +237,5 @@ Java_com_whispercpp_whisper_WhisperLib_00024Companion_benchGgmlMulMat(JNIEnv *en
     UNUSED(thiz);
     const char *bench_ggml_mul_mat = whisper_bench_ggml_mul_mat_str(n_threads);
     jstring string = (*env)->NewStringUTF(env, bench_ggml_mul_mat);
+    return string;
 }