diff --git a/image_analysis/spot_finding/ImageAnalysisGPU.cu b/image_analysis/spot_finding/ImageAnalysisGPU.cu
index 2aa6cbbb..f7171c2d 100644
--- a/image_analysis/spot_finding/ImageAnalysisGPU.cu
+++ b/image_analysis/spot_finding/ImageAnalysisGPU.cu
@@ -303,7 +303,7 @@ void GPUImageAnalysis::RunSpotFinder(const SpotFindingSettings &settings) {
     // data_in is CUDA registered memory
 
     // Run COLSPOT (GPU version)
-    spot_parameters spot_params;
+    spot_parameters spot_params{};
     spot_params.strong_pixel_threshold2 = settings.signal_to_noise_threshold * settings.signal_to_noise_threshold;
     spot_params.nbx = NBX;
     spot_params.nby = NBX;
@@ -375,7 +375,7 @@ void GPUImageAnalysis::GetSpotFinderResults(const DiffractionExperiment &experim
 }
 
 void GPUImageAnalysis::RegisterBuffer() {
-    cudaHostRegister(host_in, xpixels * ypixels * sizeof(uint16_t), cudaHostRegisterDefault);
+    cudaHostRegister(host_in, xpixels * ypixels * sizeof(int32_t), cudaHostRegisterDefault);
 }
 
 void GPUImageAnalysis::UnregisterBuffer() {
@@ -386,5 +386,5 @@ void GPUImageAnalysis::LoadDataToGPU() {
     if (host_in == nullptr)
         throw JFJochException(JFJochExceptionCategory::SpotFinderError, "Host/GPU buffer not defined");
 
-    cuda_err(cudaMemcpy(gpu_in, host_in, xpixels * ypixels * sizeof(int16_t), cudaMemcpyHostToDevice));
+    cuda_err(cudaMemcpy(gpu_in, host_in, xpixels * ypixels * sizeof(int32_t), cudaMemcpyHostToDevice));
 }