1 files changed, 1 insertions, 1 deletions
diff --git a/gr-wxgui/lib/histo_sink_f_impl.h b/gr-wxgui/lib/histo_sink_f_impl.h
index e160e0e550..98b0fe6706 100644
--- a/gr-wxgui/lib/histo_sink_f_impl.h
+++ b/gr-wxgui/lib/histo_sink_f_impl.h
@@ -37,7 +37,7 @@ namespace gr {
       unsigned int d_sample_count;
       unsigned int *d_bins;
       float *d_samps;
-      gruel::mutex d_mutex;
+      gr::thread::mutex d_mutex;
 
       void send_frame(void);
       void clear(void);