diff --git a/src/output/plugins/PulseOutputPlugin.cxx b/src/output/plugins/PulseOutputPlugin.cxx
index ae88d2134..158b36dfd 100644
--- a/src/output/plugins/PulseOutputPlugin.cxx
+++ b/src/output/plugins/PulseOutputPlugin.cxx
@@ -42,7 +42,9 @@
 
 #define MPD_PULSE_NAME "Music Player Daemon"
 
-struct PulseOutput {
+class PulseOutput {
+	friend struct AudioOutputWrapper<PulseOutput>;
+
 	AudioOutput base;
 
 	const char *name;
diff --git a/src/output/plugins/PulseOutputPlugin.hxx b/src/output/plugins/PulseOutputPlugin.hxx
index 33f02e1a8..f193db1d8 100644
--- a/src/output/plugins/PulseOutputPlugin.hxx
+++ b/src/output/plugins/PulseOutputPlugin.hxx
@@ -20,7 +20,7 @@
 #ifndef MPD_PULSE_OUTPUT_PLUGIN_HXX
 #define MPD_PULSE_OUTPUT_PLUGIN_HXX
 
-struct PulseOutput;
+class PulseOutput;
 class PulseMixer;
 struct pa_cvolume;
 class Error;