diff --git a/ChangeLog b/ChangeLog
index 575ef47b..bd5ca47a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -15727,3 +15727,5 @@
 	* Incremented the package version to 2.15.3int00.
 2017-04-11 Fred Gleason <fredg@paravelsystems.com>
 	* Fixed a typo in 'lib/Makefile.am'.
+2017-04-11 Fred Gleason <fredg@paravelsystems.com>
+	* Fixed a bug in 'lib/rduser.cpp' that broke the build on Windows.
diff --git a/lib/rduser.cpp b/lib/rduser.cpp
index 7a6fc6c9..32d331c7 100644
--- a/lib/rduser.cpp
+++ b/lib/rduser.cpp
@@ -67,13 +67,14 @@ bool RDUser::authenticated(bool webuser) const
     }
     delete q;
   }
+#ifndef WIN32
   else {
     QString cmd=
       "rdauth "+pamService()+" \""+user_name+"\" \""+user_password+"\"";
     int exitcode=system(cmd);
     return WEXITSTATUS(exitcode)==0;
   }
-
+#endif  // WIN32
   return false;
 }