diff --git a/fs/fs.c b/fs/fs.c
index 38917bf..db4621a 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -1525,7 +1525,9 @@
 		return -1;
 	dev = cdev->dev;
 
-	size = min((loff_t)count, resource_size(&dev->resource[0]) - offset);
+	size = min((resource_size_t)count,
+			resource_size(&dev->resource[0]) -
+			(resource_size_t)offset);
 	memcpy_sz(buf, dev_get_mem_region(dev, 0) + offset, size, flags & O_RWSIZE_MASK);
 	return size;
 }
@@ -1540,7 +1542,9 @@
 		return -1;
 	dev = cdev->dev;
 
-	size = min((loff_t)count, resource_size(&dev->resource[0]) - offset);
+	size = min((resource_size_t)count,
+			resource_size(&dev->resource[0]) -
+			(resource_size_t)offset);
 	memcpy_sz(dev_get_mem_region(dev, 0) + offset, buf, size, flags & O_RWSIZE_MASK);
 	return size;
 }