diff --git a/third_party/siphash.h b/third_party/siphash.h
index 8caab4a7..1d735af6 100644
--- a/third_party/siphash.h
+++ b/third_party/siphash.h
@@ -1,4 +1,7 @@
 #pragma once
 
+#include <stddef.h>
+#include <stdint.h>
+
 int siphash(const uint8_t *in, const size_t inlen, const uint8_t *k,
-            uint8_t *out, const size_t outlen);
\ No newline at end of file
+            uint8_t *out, const size_t outlen);