diff --git a/src/system/kernel/device_manager/devfs.cpp b/src/system/kernel/device_manager/devfs.cpp
index 7cc1ebcc90..ca77751768 100644
--- a/src/system/kernel/device_manager/devfs.cpp
+++ b/src/system/kernel/device_manager/devfs.cpp
@@ -487,7 +487,7 @@ translate_partition_access(devfs_partition* partition, off_t& offset,
 	ASSERT(offset >= 0);
 	ASSERT(offset < partition->info.size);
 
-	size = min_c(size, (size_t)(partition->info.size - offset));
+	size = (size_t)min_c((off_t)size, partition->info.size - offset);
 	offset += partition->info.offset;
 }