diff --git a/GPU/GPUTracking/DataCompression/GPUTPCCompressionTrackModel.cxx b/GPU/GPUTracking/DataCompression/GPUTPCCompressionTrackModel.cxx
index 1939a58f64a1e..fba36a69d10b4 100644
--- a/GPU/GPUTracking/DataCompression/GPUTPCCompressionTrackModel.cxx
+++ b/GPU/GPUTracking/DataCompression/GPUTPCCompressionTrackModel.cxx
@@ -840,7 +840,7 @@ GPUd() void GPUTPCCompressionTrackModel::calculateMaterialCorrection()
 
   // Approximate energy loss fluctuation (M.Ivanov)
 
-  const float knst = 0.0007f; // To be tuned.
+  const float knst = 0.07f; // To be tuned.
   mMaterial.sigmadE2 = knst * mMaterial.EP2 * qpt;
   mMaterial.sigmadE2 = mMaterial.sigmadE2 * mMaterial.sigmadE2;