diff --git a/libs/surfaces/control_protocol/wscript b/libs/surfaces/control_protocol/wscript
index eb0f2cdae9..95f5624636 100644
--- a/libs/surfaces/control_protocol/wscript
+++ b/libs/surfaces/control_protocol/wscript
@@ -28,7 +28,7 @@ def build(bld):
     obj.export_includes = ['.', './control_protocol' ]
     obj.cxxflags     = '-DPACKAGE="ardour_cp" -fPIC'
     obj.includes     = ['.', './control_protocol']
-    obj.defines      = [ 'ARDOURSURFACE_DLL_EXPORTS' ]
+    obj.defines      = [ 'ARDOURCP_DLL_EXPORTS' ]
     obj.name         = 'libardour_cp'
     obj.target       = 'ardourcp'
     obj.use          = 'ardour libtimecode'