diff --git a/programs/pkey/rsa_genkey.c b/programs/pkey/rsa_genkey.c
index 861e2c7..48d8c5e 100644
--- a/programs/pkey/rsa_genkey.c
+++ b/programs/pkey/rsa_genkey.c
@@ -154,6 +154,7 @@
         fclose( fpriv );
 
     rsa_free( &rsa );
+    ctr_drbg_free( &ctr_drbg );
     entropy_free( &entropy );
 
 #if defined(_WIN32)