diff --git a/src/gui/editors/segment/segmentcanvas/AudioPreviewUpdater.cpp b/src/gui/editors/segment/segmentcanvas/AudioPreviewUpdater.cpp
index 182eb9b..172ff40 100644
--- a/src/gui/editors/segment/segmentcanvas/AudioPreviewUpdater.cpp
+++ b/src/gui/editors/segment/segmentcanvas/AudioPreviewUpdater.cpp
@@ -22,6 +22,7 @@
     COPYING included with this distribution for more information.
 */
 
+#include <unistd.h>
 
 #include "AudioPreviewUpdater.h"
 
diff --git a/src/gui/editors/segment/segmentcanvas/AudioPreviewUpdater.h b/src/gui/editors/segment/segmentcanvas/AudioPreviewUpdater.h
index 71b2546..184bb33 100644
--- a/src/gui/editors/segment/segmentcanvas/AudioPreviewUpdater.h
+++ b/src/gui/editors/segment/segmentcanvas/AudioPreviewUpdater.h
@@ -28,6 +28,7 @@
 
 #include <stdint.h>
 
+#include <unistd.h>
 #include <tqobject.h>
 #include <tqrect.h>
 #include <vector>