diff --git a/src/graph/generation/urn_sampler.hh b/src/graph/generation/urn_sampler.hh
index 92a6c0165a52c98ded6bf510f5ad178a7f6bcee6..a53637aae6ef92fc40f971610cc4e1c196e21615 100644
--- a/src/graph/generation/urn_sampler.hh
+++ b/src/graph/generation/urn_sampler.hh
@@ -54,7 +54,7 @@ public:
     {
         uniform_int_distribution<size_t> sample(0, _urn.size() - 1);
         size_t i = sample(rng);
-        if (replacement)
+        if constexpr (replacement)
         {
             return _urn[i];
         }