diff --git a/src/libstore/nar-accessor.cc b/src/libstore/nar-accessor.cc
index 6376efbf4..9a541bb77 100644
--- a/src/libstore/nar-accessor.cc
+++ b/src/libstore/nar-accessor.cc
@@ -73,7 +73,10 @@ struct NarAccessor : public SourceAccessor
         NarMember & createMember(const CanonPath & path, NarMember member)
         {
             size_t level = 0;
-            for (auto _ : path) ++level;
+            for (auto _ : path) {
+                (void)_;
+                ++level;
+            }
 
             while (parents.size() > level) parents.pop();