diff --git a/sdrbase/dsp/dspengine.cpp b/sdrbase/dsp/dspengine.cpp
index 18bd33349..4685a4707 100644
--- a/sdrbase/dsp/dspengine.cpp
+++ b/sdrbase/dsp/dspengine.cpp
@@ -199,5 +199,5 @@ void DSPEngine::createFFTFactory(const QString& fftWisdomFileName)
 
 void DSPEngine::preAllocateFFTs()
 {
-    m_fftFactory->preallocate(7, 12, 1, 0); // pre-acllocate forward FFT only 1 per size from 128 to 4096
+    m_fftFactory->preallocate(7, 10, 1, 0); // pre-acllocate forward FFT only 1 per size from 128 to 1024
 }
\ No newline at end of file