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-rw-r--r--src/libexpr/primops/fromTOML.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/primops/fromTOML.cc b/src/libexpr/primops/fromTOML.cc
index ae8aba612bb9..12e5de08e51d 100644
--- a/src/libexpr/primops/fromTOML.cc
+++ b/src/libexpr/primops/fromTOML.cc
@@ -20,7 +20,7 @@ static void prim_fromTOML(EvalState & state, const Pos & pos, Value * * args, Va
         if (auto t2 = t->as_table()) {
 
             size_t size = 0;
-            for (auto & i : *t2) size++;
+            for (auto & i : *t2) { (void) i; size++; }
 
             state.mkAttrs(v, size);