diff --git a/src/gpu/VirtualFluids_GPU/GPU/StressBCs27.cu b/src/gpu/VirtualFluids_GPU/GPU/StressBCs27.cu
index 8be82334c7e3601804d2893966d325dcf773f694..3c361a492f575825dd22df5cfa27ed52ba488feb 100644
--- a/src/gpu/VirtualFluids_GPU/GPU/StressBCs27.cu
+++ b/src/gpu/VirtualFluids_GPU/GPU/StressBCs27.cu
@@ -581,7 +581,7 @@ __global__ void QStressDeviceComp27(real* DD,
       // ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
       real VeloX=0.0, VeloY=0.0, VeloZ=0.0;
 
-      q = q_dirB[k];
+      q = 0.5f;
       real eps = 0.001f;
 
       iMEM( k, k_N[k],