diff --git a/src/OpenMesh/Tools/Decimater/ModAspectRatioT.hh b/src/OpenMesh/Tools/Decimater/ModAspectRatioT.hh
index ac15b0a0..ddd3f71d 100644
--- a/src/OpenMesh/Tools/Decimater/ModAspectRatioT.hh
+++ b/src/OpenMesh/Tools/Decimater/ModAspectRatioT.hh
@@ -88,7 +88,7 @@ class ModAspectRatioT: public ModBaseT<MeshT> {
     typedef typename Mesh::Point Point;
 
     /// constructor
-    ModAspectRatioT(MeshT& _mesh, float _min_aspect = 5.0, bool _is_binary =
+    explicit ModAspectRatioT(MeshT& _mesh, float _min_aspect = 5.0, bool _is_binary =
         true) :
         Base(_mesh, _is_binary), mesh_(Base::mesh()), min_aspect_(
             1.f / _min_aspect) {
diff --git a/src/OpenMesh/Tools/Decimater/ModEdgeLengthT.hh b/src/OpenMesh/Tools/Decimater/ModEdgeLengthT.hh
index e21b3223..cd21bfdb 100644
--- a/src/OpenMesh/Tools/Decimater/ModEdgeLengthT.hh
+++ b/src/OpenMesh/Tools/Decimater/ModEdgeLengthT.hh
@@ -79,7 +79,7 @@ class ModEdgeLengthT: public ModBaseT<MeshT> {
     ;
 
     /// Constructor
-    ModEdgeLengthT(MeshT& _mesh, float _edge_length = FLT_MAX,
+    explicit ModEdgeLengthT(MeshT& _mesh, float _edge_length = FLT_MAX,
         bool _is_binary = true);
 
     /// get edge_length
diff --git a/src/OpenMesh/Tools/Decimater/ModHausdorffT.hh b/src/OpenMesh/Tools/Decimater/ModHausdorffT.hh
index 12b046c5..4f16f623 100644
--- a/src/OpenMesh/Tools/Decimater/ModHausdorffT.hh
+++ b/src/OpenMesh/Tools/Decimater/ModHausdorffT.hh
@@ -87,7 +87,7 @@ class ModHausdorffT: public ModBaseT<MeshT> {
     typedef std::vector<Point> Points;
 
     /// Constructor
-    ModHausdorffT(MeshT& _mesh, Scalar _error_tolerance = FLT_MAX) :
+    explicit ModHausdorffT(MeshT& _mesh, Scalar _error_tolerance = FLT_MAX) :
         Base(_mesh, true), mesh_(Base::mesh()), tolerance_(_error_tolerance) {
       mesh_.add_property(points_);
     }