diff --git a/src/Unittests/unittests_decimater.hh b/src/Unittests/unittests_decimater.hh
index 87bce7fc4b0ca6862dd231a112f6e7924a811b88..0b6582f24d8e1dd0026f58b42d0380090647edc4 100644
--- a/src/Unittests/unittests_decimater.hh
+++ b/src/Unittests/unittests_decimater.hh
@@ -53,7 +53,7 @@ TEST_F(OpenMeshDecimater, DecimateMesh) {
   removedVertices = decimaterDBG.decimate_to(5000);
                     decimaterDBG.mesh().garbage_collection();
 
-  EXPECT_EQ(2526, removedVertices)     << "The number of remove vertices is not correct!";
+  EXPECT_EQ(2526u, removedVertices)     << "The number of remove vertices is not correct!";
   EXPECT_EQ(5000u, mesh_.n_vertices()) << "The number of vertices after decimation is not correct!";
   EXPECT_EQ(14994u, mesh_.n_edges())   << "The number of edges after decimation is not correct!";
   EXPECT_EQ(9996u, mesh_.n_faces())    << "The number of faces after decimation is not correct!";