diff --git a/unix/common/RandrGlue.h b/unix/common/RandrGlue.h
index 43c9b68..8618119 100644
--- a/unix/common/RandrGlue.h
+++ b/unix/common/RandrGlue.h
@@ -45,6 +45,7 @@
 
 int vncRandRIsOutputEnabled(int outputIdx);
 int vncRandRIsOutputUsable(int outputIdx);
+int vncRandRIsOutputConnected(int outputIdx);
 
 int vncRandRDisableOutput(int outputIdx);
 int vncRandRReconfigureOutput(int outputIdx, int x, int y,