diff --git a/surface/include/pcl/surface/3rdparty/opennurbs/opennurbs_system.h b/surface/include/pcl/surface/3rdparty/opennurbs/opennurbs_system.h
index 384e7bac8..cde079401 100644
--- a/surface/include/pcl/surface/3rdparty/opennurbs/opennurbs_system.h
+++ b/surface/include/pcl/surface/3rdparty/opennurbs/opennurbs_system.h
@@ -137,15 +137,15 @@
 #if defined(_M_X64) && defined(WIN32) && defined(WIN64)
 // 23 August 2007 Dale Lear
 
-#if defined(_INC_WINDOWS)
+//#if defined(_INC_WINDOWS)
 // The user has included Microsoft's windows.h before opennurbs.h,
 // and windows.h has nested includes that unconditionally define WIN32.
 // Just undo the damage here or everybody that includes opennurbs.h after
 // windows.h has to fight with this Microsoft bug.
 #undef WIN32
-#else
-#error do not define WIN32 for x64 builds
-#endif
+//#else
+//#error do not define WIN32 for x64 builds
+//#endif
 
 // NOTE _WIN32 is defined for any type of Windows build
 #endif