diff --git a/build.rs b/build.rs
index 5d5406c..82b7a43 100644
--- a/build.rs
+++ b/build.rs
@@ -37,6 +37,15 @@ fn main() {
         }
     }
 
+    // autocfg generates probe files in $OUT_DIR with nondeterministic contents.
+    // (In autocfg 1.4, the filenames are nondeterministic as well.)
+    let out_dir_env = env::var("OUT_DIR").unwrap();
+    let out_dir = Path::new(&out_dir_env);
+    std::fs::remove_file(out_dir.join("probe0.ll")).unwrap();
+    std::fs::remove_file(out_dir.join("probe1.ll")).unwrap();
+    std::fs::remove_file(out_dir.join("probe2.ll")).unwrap();
+    std::fs::remove_file(out_dir.join("probe3.ll")).unwrap();
+
     autocfg::rerun_path("build.rs");
 
     write_radix_bases().unwrap();