diff --git a/Code/Mantid/Framework/SINQ/src/PoldiFitPeaks2D.cpp b/Code/Mantid/Framework/SINQ/src/PoldiFitPeaks2D.cpp
index 03f0f205eef0..6653f1c3cfbc 100644
--- a/Code/Mantid/Framework/SINQ/src/PoldiFitPeaks2D.cpp
+++ b/Code/Mantid/Framework/SINQ/src/PoldiFitPeaks2D.cpp
@@ -391,6 +391,7 @@ PoldiFitPeaks2D::getQSpectrum(const FunctionDomain1D &domain,
     yData[offset - i] = values[i];
   }
 
+  ws1D->getAxis(0)->setUnit("MomentumTransfer");
   return ws1D;
 }