diff --git a/tests/api.c b/tests/api.c
index 7d2be356b..bcc1e9d78 100644
--- a/tests/api.c
+++ b/tests/api.c
@@ -146,6 +146,7 @@
 #endif
 #include <wolfssl/error-ssl.h>
 
+#include <stdint.h>
 #include <stdlib.h>
 #include <wolfssl/ssl.h>  /* compatibility layer */
 #include <wolfssl/test.h>