diff --git a/SConstruct b/SConstruct
index ad19581cb7..13ea90441a 100644
--- a/SConstruct
+++ b/SConstruct
@@ -577,7 +577,7 @@ if env['LV2']:
 	if conf.CheckPKGVersion('slv2', '0.6.4'):
 		libraries['slv2'] = LibraryInfo()
 		libraries['slv2'].ParseConfig('pkg-config --cflags --libs slv2')
-                env.Append (CCFLAGS="-DHAVE_LV2")
+                env.Append (CCFLAGS="-DHAVE_SLV2")
 	else:
 		print 'LV2 support is not enabled (SLV2 not found or older than 0.6.4 (svn))'
 		env['LV2'] = 0
diff --git a/gtk2_ardour/SConscript b/gtk2_ardour/SConscript
index f09df7263a..26195583c8 100644
--- a/gtk2_ardour/SConscript
+++ b/gtk2_ardour/SConscript
@@ -303,7 +303,7 @@ lv2_files = [ 'lv2_plugin_ui.cc' ]
 
 if env['LV2']:
 	extra_sources += lv2_files
-	gtkardour.Append (CCFLAGS="-DHAVE_LV2")
+	gtkardour.Append (CCFLAGS="-DHAVE_SLV2")
 	gtkardour.Merge ([libraries['slv2']])
 
 
diff --git a/gtk2_ardour/plugin_selector.cc b/gtk2_ardour/plugin_selector.cc
index 5f5930c41c..8932585544 100644
--- a/gtk2_ardour/plugin_selector.cc
+++ b/gtk2_ardour/plugin_selector.cc
@@ -337,7 +337,7 @@ PluginSelector::ladspa_refiller (const std::string& filterstr)
 void
 PluginSelector::lv2_refiller (const std::string& filterstr)
 {
-#ifdef HAVE_LV2
+#ifdef HAVE_SLV2
 	refiller (manager->lv2_plugin_info(), filterstr, "LV2");
 #endif
 }
@@ -543,7 +543,7 @@ PluginSelector::plugin_menu()
 #ifdef HAVE_AUDIOUNITS
 	all_plugs.insert (all_plugs.end(), manager->au_plugin_info().begin(), manager->au_plugin_info().end());
 #endif
-#ifdef HAVE_LV2
+#ifdef HAVE_SLV2
 	all_plugs.insert (all_plugs.end(), manager->lv2_plugin_info().begin(), manager->lv2_plugin_info().end());
 #endif
 
diff --git a/gtk2_ardour/wscript b/gtk2_ardour/wscript
index 92a3650a28..b4cf807688 100644
--- a/gtk2_ardour/wscript
+++ b/gtk2_ardour/wscript
@@ -227,6 +227,8 @@ def build(bld):
 	obj.cxxflags     += ['-DMODULE_DIR="' + os.path.normpath(bld.env['LIBDIRNAME']) + '"']
 	obj.cxxflags     += ['-DLOCALEDIR="' + os.path.join(
 			os.path.normpath(bld.env['DATADIRNAME']), 'locale') + '"']
+	if bld.env['HAVE_SLV2']:
+		obj.cxxflags += ['-DHAVE_SLV2']
 	
 	# Wrappers
 
diff --git a/libs/ardour/wscript b/libs/ardour/wscript
index b087e194c2..11372b885a 100644
--- a/libs/ardour/wscript
+++ b/libs/ardour/wscript
@@ -234,6 +234,7 @@ def build(bld):
 	if bld.env['HAVE_SLV2']:
 		obj.source += ' lv2_plugin.cc '
 		obj.uselib += ' SLV2 '
+		obj.cxxflags += ['-DHAVE_SLV2']
 	
 def shutdown():
 	autowaf.shutdown()