diff --git a/examples/cpp/silero-vad-onnx.cpp b/examples/cpp/silero-vad-onnx.cpp
index 8c961fe..34408c2 100644
--- a/examples/cpp/silero-vad-onnx.cpp
+++ b/examples/cpp/silero-vad-onnx.cpp
@@ -134,7 +134,7 @@ public:
             // b. silence >= min_slience_samples, end speaking
             else
             {
-                speech_end = temp_end ？temp_end + speech_pad_samples : current_sample + speech_pad_samples;
+                speech_end = temp_end ? temp_end + speech_pad_samples : current_sample + speech_pad_samples;
                 temp_end = 0;
                 triggerd = false;
                 printf("{ end: %.3f s }\n", 1.0 * speech_end / sample_rate);