diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index bd4168a44..6b5c33806 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -5028,12 +5028,6 @@ void EvalState::createBaseEnv(const EvalSettings & evalSettings)
         addPrimOp(std::move(primOpAdjusted));
     }
 
-    for (auto & primOp : evalSettings.extraPrimOps) {
-        auto primOpAdjusted = primOp;
-        primOpAdjusted.arity = std::max(primOp.args.size(), primOp.arity);
-        addPrimOp(std::move(primOpAdjusted));
-    }
-
     /* Add a wrapper around the derivation primop that computes the
        `drvPath' and `outPath' attributes lazily.