diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 6955aacbf..0d9226d3b 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -1660,7 +1660,7 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
                         (lambda.name
                             ? concatStrings("'", symbols[lambda.name], "'")
                             : "anonymous lambda"));
-                    addErrorTrace(e, pos, "from call site%s", "");
+                    addErrorTrace(e, pos, "while evaluating call site%s", "");
                 }
                 throw;
             }
diff --git a/src/libexpr/flake/flake.cc b/src/libexpr/flake/flake.cc
index 6b5d6f6b3..6344fb253 100644
--- a/src/libexpr/flake/flake.cc
+++ b/src/libexpr/flake/flake.cc
@@ -143,7 +143,7 @@ static FlakeInput parseFlakeInput(EvalState & state,
         } catch (Error & e) {
             e.addTrace(
                 state.positions[attr.pos],
-                hintfmt("in flake attribute '%s'", state.symbols[attr.name]));
+                hintfmt("while evaluating flake attribute '%s'", state.symbols[attr.name]));
             throw;
         }
     }
@@ -152,7 +152,7 @@ static FlakeInput parseFlakeInput(EvalState & state,
         try {
             input.ref = FlakeRef::fromAttrs(attrs);
         } catch (Error & e) {
-            e.addTrace(state.positions[pos], hintfmt("in flake input"));
+            e.addTrace(state.positions[pos], hintfmt("while evaluating flake input"));
             throw;
         }
     else {