pkey: Remove dependency on X.509
diff --git a/programs/pkey/rsa_sign_pss.c b/programs/pkey/rsa_sign_pss.c
index 42209e2..5019f28 100644
--- a/programs/pkey/rsa_sign_pss.c
+++ b/programs/pkey/rsa_sign_pss.c
@@ -55,7 +55,7 @@
 #include "mbedtls/ctr_drbg.h"
 #include "mbedtls/md.h"
 #include "mbedtls/rsa.h"
-#include "mbedtls/x509.h"
+#include "mbedtls/pk.h"
 
 #include <stdio.h>
 #include <string.h>