diff --git a/passes/opt/peepopt_sub_neg.pmg b/passes/opt/peepopt_sub_neg.pmg
index 24e617052..83141cab8 100644
--- a/passes/opt/peepopt_sub_neg.pmg
+++ b/passes/opt/peepopt_sub_neg.pmg
@@ -58,5 +58,6 @@ code
 
 	// Log, fixup, accept
 	log("sub_neg pattern in %s: neg=%s, sub=%s\n", log_id(module), log_id(neg), log_id(sub));
+	sub->fixup_parameters();
 	accept;
 endcode
diff --git a/tests/peepopt/neg_sub.ys.DISABLED b/tests/peepopt/neg_sub.ys
similarity index 100%
rename from tests/peepopt/neg_sub.ys.DISABLED
rename to tests/peepopt/neg_sub.ys