diff --git a/.cirrus.yml b/.cirrus.yml
index 3f1b187dd..ee2eb7d43 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -3,6 +3,11 @@ freebsd_instance:
 
 env:
   RUST_BACKTRACE: 1
+  # Workaround `error: sysinfo not supported on this platform`
+  # seen on FreeBSD platforms, affecting rustup
+  #
+  # References: https://github.com/rust-lang/rustup/issues/2774
+  RUSTUP_IO_THREADS: 1
 
 freebsd_task:
   name: $TOOLCHAIN x86_64-unknown-freebsd