diff --git a/programs/pkey/gen_key.c b/programs/pkey/gen_key.c
index 2f3ba35..67e3747 100644
--- a/programs/pkey/gen_key.c
+++ b/programs/pkey/gen_key.c
@@ -388,6 +388,7 @@
     }
 
     pk_free( &key );
+    ctr_drbg_free( &ctr_drbg );
     entropy_free( &entropy );
 
 #if defined(_WIN32)