diff --git a/libc/kernel/uapi/linux/dma-heap.h b/libc/kernel/uapi/linux/dma-heap.h
index 467e336..ac86b59 100644
--- a/libc/kernel/uapi/linux/dma-heap.h
+++ b/libc/kernel/uapi/linux/dma-heap.h
@@ -9,7 +9,7 @@
 #include <linux/ioctl.h>
 #include <linux/types.h>
 #define DMA_HEAP_VALID_FD_FLAGS (O_CLOEXEC | O_ACCMODE)
-#define DMA_HEAP_VALID_HEAP_FLAGS (0)
+#define DMA_HEAP_VALID_HEAP_FLAGS (0ULL)
 struct dma_heap_allocation_data {
   __u64 len;
   __u32 fd;