diff --git a/Tests/NumLib/TestCoordinatesMapping.cpp b/Tests/NumLib/TestCoordinatesMapping.cpp
index 3c3032fe74ce2e5a9a98d00dd305c8230d5a3933..ddf44df0a2d050e58261ec40f255895d22eac8d7 100644
--- a/Tests/NumLib/TestCoordinatesMapping.cpp
+++ b/Tests/NumLib/TestCoordinatesMapping.cpp
@@ -311,7 +311,7 @@ TEST(NumLib, FemNaturalCoordinatesMappingLineY)
 	double exp_dNdx[2*e_nnodes] = {0, 0, -0.5, 0.5};
 	ASSERT_ARRAY_NEAR(exp_dNdx, shape.dNdx.data(), shape.dNdx.size(), eps);
 
-	for (auto n = 0; n < line->getNNodes(); ++n)
+	for (auto n = 0u; n < line->getNNodes(); ++n)
 		delete line->getNode(n);
 	delete line;
 }