diff --git a/Code/Visu/otbGluPolygonDrawingHelper.cxx b/Code/Visu/otbGluPolygonDrawingHelper.cxx
index 5e7134044d7904809289c8bbec4e189dd82c77ac..07800da02e275338f6b533f80d8d5ca8906318e8 100644
--- a/Code/Visu/otbGluPolygonDrawingHelper.cxx
+++ b/Code/Visu/otbGluPolygonDrawingHelper.cxx
@@ -28,8 +28,9 @@ PURPOSE.  See the above copyright notices for more information.
 #ifndef CALLBACK 
 	#if defined(__CYGWIN__)
 		#define CALLBACK __stdcall
-	#else
+        #else
 		#define CALLBACK
+        #endif
 #endif
 
 extern "C"