diff --git a/src/libexpr/flake/flake.cc b/src/libexpr/flake/flake.cc
index ba337cf97..9e25fc116 100644
--- a/src/libexpr/flake/flake.cc
+++ b/src/libexpr/flake/flake.cc
@@ -511,6 +511,7 @@ void callFlake(EvalState & state,
     auto & vSourceInfo = *state.allocValue();
     state.mkAttrs(vSourceInfo, 8);
     emitSourceInfoAttrs(state, flake.sourceInfo, vSourceInfo);
+    vSourceInfo.attrs->sort();
 
     vInputs.attrs->push_back(Attr(state.sSelf, &vRes));