diff --git a/src/process/FFTVisualDataThread.cpp b/src/process/FFTVisualDataThread.cpp
index 2a68bd5..a5d3588 100644
--- a/src/process/FFTVisualDataThread.cpp
+++ b/src/process/FFTVisualDataThread.cpp
@@ -27,6 +27,7 @@ void FFTVisualDataThread::run() {
     DemodulatorThreadInputQueue *pipeIQDataIn = (DemodulatorThreadInputQueue *)getInputQueue("IQDataInput");
     SpectrumVisualDataQueue *pipeFFTDataOut = (SpectrumVisualDataQueue *)getOutputQueue("FFTDataOutput");
     
+    fftQueue.set_max_num_items(256);
     pipeFFTDataOut->set_max_num_items(512);
     fftDistrib.setInput(pipeIQDataIn);
     fftDistrib.attachOutput(&fftQueue);