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-rw-r--r--src/libexpr/eval.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 6f1befa2a23e..b7dab885f968 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -157,7 +157,7 @@ public:
     /* Force `v', and then verify that it has the expected type. */
     NixInt forceInt(Value & v, const Pos & pos);
     NixFloat forceFloat(Value & v, const Pos & pos);
-    bool forceBool(Value & v);
+    bool forceBool(Value & v, const Pos & pos);
     inline void forceAttrs(Value & v);
     inline void forceAttrs(Value & v, const Pos & pos);
     inline void forceList(Value & v);