diff --git a/src/diff.jl b/src/diff.jl
index 81ac4e9e2..b012d041b 100644
--- a/src/diff.jl
+++ b/src/diff.jl
@@ -653,7 +653,7 @@ let
               end
           end
           @rule ~x::issym => 0]
-    linearity_propagator = Fixpoint(Postwalk(Chain(linearity_rules); similarterm=basic_simterm))
+    linearity_propagator = Fixpoint(Postwalk(Chain(linearity_rules, true); similarterm=basic_simterm))
 
     global hessian_sparsity