diff --git a/libs/pbd/wscript b/libs/pbd/wscript
index 59f7a3368b..317ffd0c45 100644
--- a/libs/pbd/wscript
+++ b/libs/pbd/wscript
@@ -125,6 +125,8 @@ def build(bld):
 
     if bld.env['build_target'] != 'mingw':
         obj.source += [ 'crossthread.cc' ]
+    else:
+	obj.source += [ 'mingw64/mingw64_pbd.cc' ]
 
     obj.export_includes = ['.']
     obj.includes     = ['.']