diff --git a/.build.yml b/.build.yml
index 99e3ba1..5ce85d8 100644
--- a/.build.yml
+++ b/.build.yml
@@ -22,6 +22,7 @@ tasks:
         grep -q "ELF 64-bit.* x86-64.* dynamically linked"
   - test_x86_64-linux-musl: |
       cd bazel-zig-cc; ./build-and-file \
+          --platforms @io_bazel_rules_go//go/toolchain:linux_amd64_cgo \
           --extra_toolchains @zig_sdk//:x86_64-linux-musl_toolchain //test:hello | \
         grep -q "ELF 64-bit.* x86-64.* statically linked"
   - test_aarch64-linux-gnu: |
@@ -30,6 +31,7 @@ tasks:
         grep -q "ELF 64-bit.* ARM aarch64.* dynamically linked"
   - test_aarch64-linux-musl: |
       cd bazel-zig-cc; ./build-and-file \
+          --platforms @io_bazel_rules_go//go/toolchain:linux_arm64_cgo \
           --extra_toolchains @zig_sdk//:aarch64-linux-musl_toolchain //test:hello | \
         grep -q "ELF 64-bit.* ARM aarch64.* statically linked"
   - test_x86_64-macos-gnu: |
diff --git a/README.md b/README.md
index 40d50a3..2650aec 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,9 @@ bazel-bin/test/gognu_/gognu: ELF 64-bit LSB executable, x86-64, version 1 (SYSV)
 ## linux cgo + musl
 
 ```
-$ bazel build --extra_toolchains @zig_sdk//:x86_64-linux-musl_toolchain //test:hello
+$ bazel build \
+    --platforms @io_bazel_rules_go//go/toolchain:linux_amd64_cgo \
+    --extra_toolchains @zig_sdk//:x86_64-linux-musl_toolchain //test:hello
 ...
 $ file ../bazel-out/k8-fastbuild-ST-d17813c235ce/bin/test/hello_/hello
 ../bazel-out/k8-fastbuild-ST-d17813c235ce/bin/test/hello_/hello: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, Go BuildID=redacted, with debug_info, not stripped