diff --git a/map65/mainwindow.cpp b/map65/mainwindow.cpp
index 947f25969..f3d08f2a1 100644
--- a/map65/mainwindow.cpp
+++ b/map65/mainwindow.cpp
@@ -23,7 +23,7 @@
 
 #define NFFT 32768
 
-short int iwave[2*60*11025];          //Wave file for Tx audio
+short int iwave[2*60*12000];          //Wave file for Tx audio
 int nwave;                            //Length of Tx waveform
 bool btxok;                           //True if OK to transmit
 bool bTune;