diff --git a/library/compiler-builtins/.github/workflows/main.yaml b/library/compiler-builtins/.github/workflows/main.yaml
index 767566dd4147..6a4c72c5bc47 100644
--- a/library/compiler-builtins/.github/workflows/main.yaml
+++ b/library/compiler-builtins/.github/workflows/main.yaml
@@ -72,6 +72,8 @@ jobs:
           os: ubuntu-24.04
         - target: powerpc64le-unknown-linux-gnu
           os: ubuntu-24.04-ppc64le
+          # FIXME(rust#151807): remove once PPC builds work again.
+          channel: nightly-2026-01-23
         - target: riscv64gc-unknown-linux-gnu
           os: ubuntu-24.04
         - target: s390x-unknown-linux-gnu