diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 03329645f..168b3582a 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -1050,21 +1050,21 @@ void EvalState::eval(Expr * e, Value & v)
 }
 
 
-inline bool EvalState::evalBool(Env & env, Expr * e, const Pos & pos, const std::string & location)
+inline bool EvalState::evalBool(Env & env, Expr * e, const Pos & pos, const std::string & errorCtx)
 {
     Value v;
     e->eval(*this, env, v);
     if (v.type() != nBool)
-        throwTypeError(pos, "%2%: value is %1% while a Boolean was expected", v, location);
+        throwTypeError(pos, "%2%: value is %1% while a Boolean was expected", v, errorCtx);
     return v.boolean;
 }
 
 
-inline void EvalState::evalAttrs(Env & env, Expr * e, Value & v, const Pos & pos, const std::string & location)
+inline void EvalState::evalAttrs(Env & env, Expr * e, Value & v, const Pos & pos, const std::string & errorCtx)
 {
     e->eval(*this, env, v);
     if (v.type() != nAttrs)
-        throwTypeError(pos, "%2%: value is %1% while a set was expected", v, location);
+        throwTypeError(pos, "%2%: value is %1% while a set was expected", v, errorCtx);
 }
 
 
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 9e8ac4926..dadd46433 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -217,8 +217,8 @@ public:
 
     /* Evaluation the expression, then verify that it has the expected
        type. */
-    inline bool evalBool(Env & env, Expr * e, const Pos & pos, const std::string & location);
-    inline void evalAttrs(Env & env, Expr * e, Value & v, const Pos & pos, const std::string & location);
+    inline bool evalBool(Env & env, Expr * e, const Pos & pos, const std::string & errorCtx);
+    inline void evalAttrs(Env & env, Expr * e, Value & v, const Pos & pos, const std::string & errorCtx);
 
     /* If `v' is a thunk, enter it and overwrite `v' with the result
        of the evaluation of the thunk.  If `v' is a delayed function