diff --git a/programs/x509/cert_app.c b/programs/x509/cert_app.c
index dedac94..c43e662 100644
--- a/programs/x509/cert_app.c
+++ b/programs/x509/cert_app.c
@@ -449,6 +449,7 @@
     x509_crt_free( &cacert );
     x509_crt_free( &clicert );
     pk_free( &pkey );
+    entropy_free( &entropy );
 
 #if defined(_WIN32)
     printf( "  + Press Enter to exit this program.\n" );