diff --git a/tests/src/test_report.cpp b/tests/src/test_report.cpp
index 4e5e7ae..28ad3b6 100644
--- a/tests/src/test_report.cpp
+++ b/tests/src/test_report.cpp
@@ -98,7 +98,7 @@
     }
 
     std::vector<std::shared_ptr<interfaces::Metric>>
-        getMetricsFromReadingParams(const ReadingParameters& params)
+        getMetricsFromReadingParams(const ReadingParameters& params) const
     {
         const auto metricParameters =
             reportFactoryMock->convertMetricParams(params);