diff --git a/include/nuttx/crypto/crypto.h b/include/nuttx/crypto/crypto.h
index 46d798ab8ba..e13a91c6239 100644
--- a/include/nuttx/crypto/crypto.h
+++ b/include/nuttx/crypto/crypto.h
@@ -27,6 +27,8 @@
 
 #include <nuttx/config.h>
 
+#include <stdint.h>
+
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/