diff --git a/src/OpenMesh/Tools/Decimater/ModAspectRatioT.hh b/src/OpenMesh/Tools/Decimater/ModAspectRatioT.hh
index a402f1eaf5c63b53e1b504466328c1bcfd9eb7da..b91e41ce531fd1c69b22eaf45568bc44f7389d8f 100644
--- a/src/OpenMesh/Tools/Decimater/ModAspectRatioT.hh
+++ b/src/OpenMesh/Tools/Decimater/ModAspectRatioT.hh
@@ -136,7 +136,7 @@ class ModAspectRatioT: public ModBaseT<DecimaterT> {
 }// END_NS_DECIMATER
 } // END_NS_OPENMESH
 //=============================================================================
-#if defined(INCLUDE_TEMPLATES) && !defined(OPENMESH_DECIMATER_MODASPECTRATIOT_C)
+#if defined(OM_INCLUDE_TEMPLATES) && !defined(OPENMESH_DECIMATER_MODASPECTRATIOT_C)
 #define OPENMESH_DECIMATER_MODASPECTRATIOT_TEMPLATES
 #include "ModAspectRatioT.cc"
 #endif
diff --git a/src/OpenMesh/Tools/Decimater/ModEdgeLengthT.hh b/src/OpenMesh/Tools/Decimater/ModEdgeLengthT.hh
index f5230854d90ab42b45ced8765b0c3ae8bfab730f..603d9aa0a5e5fede7bee80d3687b5c3f1ce21541 100644
--- a/src/OpenMesh/Tools/Decimater/ModEdgeLengthT.hh
+++ b/src/OpenMesh/Tools/Decimater/ModEdgeLengthT.hh
@@ -109,7 +109,7 @@ class ModEdgeLengthT: public ModBaseT<DecimaterT> {
 }// END_NS_DECIMATER
 } // END_NS_OPENMESH
 //=============================================================================
-#if defined(INCLUDE_TEMPLATES) && !defined(OPENMESH_DECIMATER_MODEDGELENGTHT_C)
+#if defined(OM_INCLUDE_TEMPLATES) && !defined(OPENMESH_DECIMATER_MODEDGELENGTHT_C)
 #define MODEDGELENGTHT_TEMPLATES
 #include "ModEdgeLengthT.cc"
 #endif
diff --git a/src/OpenMesh/Tools/Decimater/ModHausdorffT.hh b/src/OpenMesh/Tools/Decimater/ModHausdorffT.hh
index 151603d72ca33486c9265351c8003221d67a6ecc..7b6b6ef6132981d747dffcd33f2ed1216467fcb0 100644
--- a/src/OpenMesh/Tools/Decimater/ModHausdorffT.hh
+++ b/src/OpenMesh/Tools/Decimater/ModHausdorffT.hh
@@ -145,7 +145,7 @@ class ModHausdorffT: public ModBaseT<DecimaterT> {
 }// END_NS_DECIMATER
 } // END_NS_OPENMESH
 //=============================================================================
-#if defined(INCLUDE_TEMPLATES) && !defined(OPENMESH_DECIMATER_MODHAUSDORFFT_C)
+#if defined(OM_INCLUDE_TEMPLATES) && !defined(OPENMESH_DECIMATER_MODHAUSDORFFT_C)
 #define OPENMESH_DECIMATER_MODHAUSDORFFT_TEMPLATES
 #include "ModHausdorffT.cc"
 #endif