diff --git a/src/pulsecore/sink.c b/src/pulsecore/sink.c
index ee6850f08..8acb77156 100644
--- a/src/pulsecore/sink.c
+++ b/src/pulsecore/sink.c
@@ -102,6 +102,8 @@ pa_sink* pa_sink_new(
     s->sw_muted = 0;
     s->hw_muted = 0;
 
+    s->is_hardware = 0;
+    
     s->get_latency = NULL;
     s->notify = NULL;
     s->set_hw_volume = NULL;
diff --git a/src/pulsecore/sink.h b/src/pulsecore/sink.h
index fdff0522d..1a6bc9886 100644
--- a/src/pulsecore/sink.h
+++ b/src/pulsecore/sink.h
@@ -60,6 +60,8 @@ struct pa_sink {
     pa_cvolume hw_volume, sw_volume;
     int hw_muted, sw_muted;
 
+    int is_hardware;
+
     void (*notify)(pa_sink*sink);
     pa_usec_t (*get_latency)(pa_sink *s);
     int (*set_hw_volume)(pa_sink *s);
diff --git a/src/pulsecore/source.c b/src/pulsecore/source.c
index 84151a929..48b6daea1 100644
--- a/src/pulsecore/source.c
+++ b/src/pulsecore/source.c
@@ -98,6 +98,8 @@ pa_source* pa_source_new(
     s->sw_muted = 0;
     s->hw_muted = 0;
 
+    s->is_hardware = 0;
+
     s->get_latency = NULL;
     s->notify = NULL;
     s->set_hw_volume = NULL;
diff --git a/src/pulsecore/source.h b/src/pulsecore/source.h
index 6255c1156..878ae34d7 100644
--- a/src/pulsecore/source.h
+++ b/src/pulsecore/source.h
@@ -61,6 +61,8 @@ struct pa_source {
 
     pa_cvolume hw_volume, sw_volume;
     int hw_muted, sw_muted;
+
+    int is_hardware;
     
     void (*notify)(pa_source*source);
     pa_usec_t (*get_latency)(pa_source *s);