diff --git a/zap/filter_core_test.go b/zap/filter_core_test.go
index 3f25a3f9e2116a3daafa9d75d5238f95204efa46..ea3a574a392f33051b8cca4920aa8b036a63bbe2 100644
--- a/zap/filter_core_test.go
+++ b/zap/filter_core_test.go
@@ -16,8 +16,9 @@ func TestFilterCore_With(t *testing.T) {
 	err := core.With([]zapcore.Field{zap.String("k", "v")}).Write(zapcore.Entry{Message: "msg"}, nil)
 	require.NoError(t, err)
 
-	require.Len(t, logs.All(), 1)
-	require.Len(t, logs.All()[0].Context, 1)
+	entries := logs.All()
+	require.Len(t, entries, 1)
+	require.Len(t, entries[0].Context, 1)
 }
 
 func TestFilterCore_Write(t *testing.T) {