diff --git a/src/internal/NeoBitmapFile.h b/src/internal/NeoBitmapFile.h
index 7a1fa5e..6979678 100644
--- a/src/internal/NeoBitmapFile.h
+++ b/src/internal/NeoBitmapFile.h
@@ -102,9 +102,9 @@ public:
 
         BitmapFileHeader bmpHeader;
         BitmapInfoHeader bmpInfoHeader;
-        int result;
+        size_t result;
 
-        result = _file.read(&bmpHeader, sizeof(bmpHeader));
+        result = _file.read((uint8_t*)(&bmpHeader), sizeof(bmpHeader));
 
         if (result != sizeof(bmpHeader) ||
             bmpHeader.FileId != c_BitmapFileId ||
@@ -113,7 +113,7 @@ public:
             goto error;
         }
 
-        result = _file.read(&bmpInfoHeader, sizeof(bmpInfoHeader));
+        result = _file.read((uint8_t*)(&bmpInfoHeader), sizeof(bmpInfoHeader));
 
         if (result != sizeof(bmpInfoHeader) ||
             result != bmpInfoHeader.Size ||