diff --git a/src/engines/gstengine.cpp b/src/engines/gstengine.cpp
index 337df9899..20e1682f4 100755
--- a/src/engines/gstengine.cpp
+++ b/src/engines/gstengine.cpp
@@ -249,7 +249,7 @@ const Engine::Scope& GstEngine::scope(int chunk_length) {
   if (have_new_buffer_) {
     if (latest_buffer_ != nullptr) {
       scope_chunks_ = ceil(((double)GST_BUFFER_DURATION(latest_buffer_) /
-                           (double)(chunk_length * 1000000)));
+                           (double)(chunk_length * kNsecPerMsec)));
     }
 
     // if the buffer is shorter than the chunk length
diff --git a/src/engines/gstengine.h b/src/engines/gstengine.h
index ad1819691..053f8f128 100755
--- a/src/engines/gstengine.h
+++ b/src/engines/gstengine.h
@@ -161,7 +161,7 @@ class GstEngine : public Engine::Base, public BufferConsumer {
   std::shared_ptr<GstEnginePipeline> CreatePipeline(const QUrl& url,
                                                     qint64 end_nanosec);
 
-  void UpdateScope(int chunk_length_);
+  void UpdateScope(int chunk_length);
 
   int AddBackgroundStream(std::shared_ptr<GstEnginePipeline> pipeline);