diff --git a/programs/x509/cert_write.c b/programs/x509/cert_write.c
index ba00dc3..94dfa1d 100644
--- a/programs/x509/cert_write.c
+++ b/programs/x509/cert_write.c
@@ -650,6 +650,7 @@
     pk_free( &loaded_subject_key );
     pk_free( &loaded_issuer_key );
     mpi_free( &serial );
+    entropy_free( &entropy );
 
 #if defined(_WIN32)
     printf( "  + Press Enter to exit this program.\n" );