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-rw-r--r--src/libexpr/eval.hh1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index cbdcb274e062..8070f4884c79 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -55,6 +55,7 @@ Expr evalFile(EvalState & state, const Path & path);
 /* Specific results. */
 string evalString(EvalState & state, Expr e);
 Path evalPath(EvalState & state, Expr e);
+bool evalBool(EvalState & state, Expr e);
 ATermList evalList(EvalState & state, Expr e);
 ATerm coerceToString(Expr e);