diff --git a/library/pk.c b/library/pk.c
index b48f4d9..d080c75 100644
--- a/library/pk.c
+++ b/library/pk.c
@@ -28,6 +28,7 @@
 #if defined(MBEDTLS_PK_C)
 #include "mbedtls/pk.h"
 #include "mbedtls/pk_internal.h"
+#include "mbedtls/pk_info.h"
 
 #if defined(MBEDTLS_RSA_C)
 #include "mbedtls/rsa.h"