diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index 325bb09..a16198f 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -24,6 +24,8 @@
 
 #include "mbedtls/build_info.h"
 
+#include "mbedtls/error.h"
+
 #include "mbedtls/ssl.h"
 #include "mbedtls/cipher.h"