diff --git a/programs/pkey/gen_key.c b/programs/pkey/gen_key.c
index 3cf682b..19f46a4 100644
--- a/programs/pkey/gen_key.c
+++ b/programs/pkey/gen_key.c
@@ -269,6 +269,7 @@
     }
 
     pk_free( &key );
+    entropy_free( &entropy );
 
 #if defined(_WIN32)
     printf( "  + Press Enter to exit this program.\n" );