diff --git a/programs/x509/cert_req.c b/programs/x509/cert_req.c
index c6d7dff..dc45f94 100644
--- a/programs/x509/cert_req.c
+++ b/programs/x509/cert_req.c
@@ -329,6 +329,7 @@
 
     x509write_csr_free( &req );
     pk_free( &key );
+    entropy_free( &entropy );
 
 #if defined(_WIN32)
     printf( "  + Press Enter to exit this program.\n" );