diff --git a/src/gui/PianoRoll.cpp b/src/gui/PianoRoll.cpp
index cfa98bc23..deeb70d7c 100644
--- a/src/gui/PianoRoll.cpp
+++ b/src/gui/PianoRoll.cpp
@@ -78,9 +78,6 @@
 typedef AutomationPattern::timeMap timeMap;
 
 
-extern Keys whiteKeys[];	// defined in piano_widget.cpp
-
-
 // some constants...
 const int INITIAL_PIANOROLL_HEIGHT = 480;