diff --git a/com-on-air_cs-linux/tools/dectshark/scanmode_gui.cpp b/com-on-air_cs-linux/tools/dectshark/scanmode_gui.cpp
index 9ef84fa..bcbcac3 100644
--- a/com-on-air_cs-linux/tools/dectshark/scanmode_gui.cpp
+++ b/com-on-air_cs-linux/tools/dectshark/scanmode_gui.cpp
@@ -4,6 +4,8 @@ found_dects	founds;
 
 scanmode_gui::scanmode_gui(int x,int y)
 {
+	pthread_mutex_init(&mutex,NULL);
+
 	selected=startpos=displaypos=0;
 
 	scrw=x;
diff --git a/com-on-air_cs-linux/tools/dectshark/syncmode_gui.cpp b/com-on-air_cs-linux/tools/dectshark/syncmode_gui.cpp
index 58ce506..ab001c7 100644
--- a/com-on-air_cs-linux/tools/dectshark/syncmode_gui.cpp
+++ b/com-on-air_cs-linux/tools/dectshark/syncmode_gui.cpp
@@ -10,6 +10,8 @@ syncmode_gui::syncmode_gui(int x,int y)
 {
 	int i;
 
+	pthread_mutex_init(&mutex,NULL);
+
 	selx=sely=0;
 
 	scrw=x;