diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh
index cbe9a45bf..8df8055b3 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -17,7 +17,7 @@ MakeError(ThrownError, AssertionError);
 MakeError(Abort, EvalError);
 MakeError(TypeError, EvalError);
 MakeError(UndefinedVarError, Error);
-MakeError(MissingArgumentError, Error);
+MakeError(MissingArgumentError, EvalError);
 MakeError(RestrictedPathError, Error);