diff --git a/apps/gpu/LBM/SphereScaling/SphereScaling.cpp b/apps/gpu/LBM/SphereScaling/SphereScaling.cpp
index b0ead7181404528d24a519b81ff4e10abbbb640e..fbde84da226c4076990cde7b1dfeb76f7b66a645 100644
--- a/apps/gpu/LBM/SphereScaling/SphereScaling.cpp
+++ b/apps/gpu/LBM/SphereScaling/SphereScaling.cpp
@@ -205,7 +205,7 @@ void multipleLevel(const std::string& configPath)
                 sideLengthCube = 70.0; // Phoenix: weak scaling with two levels = 70.0
         }
         else
-            sideLengthCube = 86.0; // Phoenix: 86.0
+            sideLengthCube = 92.0; // Phoenix: 86.0
         real xGridMin          = 0.0; 
         real xGridMax          = sideLengthCube;
         real yGridMin          = 0.0;
diff --git a/src/gpu/VirtualFluids_GPU/Kernel/Kernels/BasicKernels/FluidFlow/Compressible/CumulantK17chimStream/CumulantK17CompChimStreamDevice.cu b/src/gpu/VirtualFluids_GPU/Kernel/Kernels/BasicKernels/FluidFlow/Compressible/CumulantK17chimStream/CumulantK17CompChimStreamDevice.cu
index 6378b691daf5cf86c5443a748d05fc2fc667a290..da37bb1e2fee675cb07410d483dac21dc84215dc 100644
--- a/src/gpu/VirtualFluids_GPU/Kernel/Kernels/BasicKernels/FluidFlow/Compressible/CumulantK17chimStream/CumulantK17CompChimStreamDevice.cu
+++ b/src/gpu/VirtualFluids_GPU/Kernel/Kernels/BasicKernels/FluidFlow/Compressible/CumulantK17chimStream/CumulantK17CompChimStreamDevice.cu
@@ -45,7 +45,7 @@ extern "C" __global__ void LB_Kernel_CumulantK17CompChimStream(
 	uint* neighborY,
 	uint* neighborZ,
 	real* distributions,
-	int size_Mat,
+	unsigned long size_Mat,
 	int level,
 	real* forces,
 	real* quadricLimiters,
diff --git a/src/gpu/VirtualFluids_GPU/Kernel/Kernels/BasicKernels/FluidFlow/Compressible/CumulantK17chimStream/CumulantK17CompChimStream_Device.cuh b/src/gpu/VirtualFluids_GPU/Kernel/Kernels/BasicKernels/FluidFlow/Compressible/CumulantK17chimStream/CumulantK17CompChimStream_Device.cuh
index 2ac08edd28561f739bb2faf701505b9f9e7217b9..035e438ccf8df70c5df43c70f0b4a5ffe160acc8 100644
--- a/src/gpu/VirtualFluids_GPU/Kernel/Kernels/BasicKernels/FluidFlow/Compressible/CumulantK17chimStream/CumulantK17CompChimStream_Device.cuh
+++ b/src/gpu/VirtualFluids_GPU/Kernel/Kernels/BasicKernels/FluidFlow/Compressible/CumulantK17chimStream/CumulantK17CompChimStream_Device.cuh
@@ -10,7 +10,7 @@ extern "C" __global__ void LB_Kernel_CumulantK17CompChimStream(
 	uint* neighborY,
 	uint* neighborZ,
 	real* distributions,
-	int size_Mat,
+	unsigned long size_Mat,
 	int level,
 	real* forces,
 	real* quadricLimiters,