diff --git a/api/include/opentelemetry/trace/tracer.h b/api/include/opentelemetry/trace/tracer.h
index 57761e5f90..e1300776f0 100644
--- a/api/include/opentelemetry/trace/tracer.h
+++ b/api/include/opentelemetry/trace/tracer.h
@@ -171,7 +171,7 @@ class Tracer
   void ForceFlush(std::chrono::duration<Rep, Period> timeout) noexcept
   {
     this->ForceFlushWithMicroseconds(
-        static_cast<uint64_t>(std::chrono::duration_cast<std::chrono::microseconds>(timeout)));
+        static_cast<uint64_t>(std::chrono::duration_cast<std::chrono::microseconds>(timeout).count()));
   }
 
   virtual void ForceFlushWithMicroseconds(uint64_t timeout) noexcept = 0;
@@ -184,7 +184,7 @@ class Tracer
   void Close(std::chrono::duration<Rep, Period> timeout) noexcept
   {
     this->CloseWithMicroseconds(
-        static_cast<uint64_t>(std::chrono::duration_cast<std::chrono::microseconds>(timeout)));
+        static_cast<uint64_t>(std::chrono::duration_cast<std::chrono::microseconds>(timeout).count()));
   }
 
   virtual void CloseWithMicroseconds(uint64_t timeout) noexcept = 0;