diff --git a/wc_model_gen/rand_gen/protein_degradation.py b/wc_model_gen/rand_gen/protein_degradation.py
index 09e5e74..9d26185 100644
--- a/wc_model_gen/rand_gen/protein_degradation.py
+++ b/wc_model_gen/rand_gen/protein_degradation.py
@@ -132,4 +132,6 @@ def gen_rate_laws(self):
 
             rl.k_cat = 2 * numpy.log(2) / prot.half_life
             rl.k_m = proteosome_conc
+            rl.equation.modifiers.append(
+                deg_protease.species.get_one(compartment=cytosol))
             rl.equation.modifiers.append(rxn.participants[0].species)