diff --git a/libs/pbd/pbd/abstract_ui.inc.cc b/libs/pbd/pbd/abstract_ui.inc.cc
index f3f735c973..049df1ebde 100644
--- a/libs/pbd/pbd/abstract_ui.inc.cc
+++ b/libs/pbd/pbd/abstract_ui.inc.cc
@@ -32,15 +32,6 @@
 
 #include "pbd/i18n.h"
 
-#ifdef COMPILER_MSVC
-#include <ardourext/misc.h>  // Needed for 'DECLARE_DEFAULT_COMPARISONS'. Objects in an STL container can be
-                             // searched and sorted. Thus, when instantiating the container, MSVC complains
-                             // if the type of object being contained has no appropriate comparison operators
-                             // defined (specifically, if operators '<' and '==' are undefined). This seems
-                             // to be the case with ptw32 'pthread_t' which is a simple struct.
-DECLARE_DEFAULT_COMPARISONS(ptw32_handle_t)
-#endif
-
 using namespace std;
 
 #ifndef NDEBUG