diff --git a/library/include/mobilisis/time_range.h b/library/include/mobilisis/time_range.h
index 57493dd..c95f387 100644
--- a/library/include/mobilisis/time_range.h
+++ b/library/include/mobilisis/time_range.h
@@ -34,6 +34,13 @@ struct TimeRange {
         m_duration = timeRange.m_duration;
         return *this;
     }
+
+    TimeRange &operator=(TimeRange const &timeRange) {
+        m_start = timeRange.m_start;
+        m_end = timeRange.m_end;
+        m_duration = timeRange.m_duration;
+        return *this;
+    }
 };
 
 #endif // TIME_RANGE_H_INCLUDED