diff --git a/Sources/CCryptoBoringSSL/crypto/hrss/hrss.c b/Sources/CCryptoBoringSSL/crypto/hrss/hrss.c
index 93a214e..eee4e58 100644
--- a/Sources/CCryptoBoringSSL/crypto/hrss/hrss.c
+++ b/Sources/CCryptoBoringSSL/crypto/hrss/hrss.c
@@ -13,6 +13,7 @@
  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
 
 #include <CCryptoBoringSSL_hrss.h>
+#include <inttypes.h>
 
 #include <assert.h>
 #include <stdio.h>
diff --git a/Sources/CCryptoBoringSSL/include/CCryptoBoringSSL_bn.h b/Sources/CCryptoBoringSSL/include/CCryptoBoringSSL_bn.h
index c86c1ef..7013140 100644
--- a/Sources/CCryptoBoringSSL/include/CCryptoBoringSSL_bn.h
+++ b/Sources/CCryptoBoringSSL/include/CCryptoBoringSSL_bn.h
@@ -126,7 +126,8 @@
 #include "CCryptoBoringSSL_base.h"
 #include "CCryptoBoringSSL_thread.h"
 
 #include <inttypes.h>  // for PRIu64 and friends
+#include <sys/types.h>
 #include <stdio.h>  // for FILE*
 
 #if defined(__cplusplus)