Adapt programs / test suites
diff --git a/programs/pkey/pk_sign.c b/programs/pkey/pk_sign.c
index 2c355d9..d80cbd7 100644
--- a/programs/pkey/pk_sign.c
+++ b/programs/pkey/pk_sign.c
@@ -151,6 +151,7 @@
 
 exit:
     pk_free( &pk );
+    ctr_drbg_free( &ctr_drbg );
     entropy_free( &entropy );
 
 #if defined(POLARSSL_ERROR_C)