1diff --git a/Cargo.toml b/Cargo.toml
2index 2656b5f..159937f 100644
3--- a/Cargo.toml
4+++ b/Cargo.toml
5@@ -93,7 +93,10 @@ optional = true
6 default-features = false
7
8 [build-dependencies.autocfg]
9-version = "1"
10+# autocfg 1.4 uses different, non-deterministic filenames. We don't
11+# actually depend on these files, but they are present in the out/
12+# directory, and it's simpler to keep them around.
13+version = "=1.1.0"
14
15 [features]
16 default = ["std"]
17