diff --git a/image_analysis/ImageAnalysisCPU.cpp b/image_analysis/ImageAnalysisCPU.cpp
index 73429eea..066ba9a9 100644
--- a/image_analysis/ImageAnalysisCPU.cpp
+++ b/image_analysis/ImageAnalysisCPU.cpp
@@ -15,7 +15,7 @@ ImageAnalysisCPU::ImageAnalysisCPU(const DiffractionExperiment &in_experiment,
           integration(in_integration),
           npixels(experiment.GetPixelsNum()),
           xpixels(experiment.GetXPixelsNum()),
-          mask_1byte(npixels, 0),
+          mask_1byte(npixels, false),
           spotFinder(in_integration),
           saturation_limit(experiment.GetSaturationLimit()),
           roi_count(0),
diff --git a/image_analysis/ImageAnalysisCPU.h b/image_analysis/ImageAnalysisCPU.h
index ea714e76..1ccd630e 100644
--- a/image_analysis/ImageAnalysisCPU.h
+++ b/image_analysis/ImageAnalysisCPU.h
@@ -22,7 +22,7 @@ class ImageAnalysisCPU {
 
     size_t npixels;
     size_t xpixels;
-    std::vector<uint8_t> mask_1byte;
+    std::vector<bool> mask_1byte;
 
     ImageSpotFinder spotFinder;
     IndexerThreadPool *indexer;