diff --git a/targets/rp2040/BUILD.bazel b/targets/rp2040/BUILD.bazel
index 6e6805b..b562acd 100644
--- a/targets/rp2040/BUILD.bazel
+++ b/targets/rp2040/BUILD.bazel
@@ -25,6 +25,7 @@
         "@pigweed//pw_build/constraints/rtos:freertos",
         "@pigweed//pw_interrupt_cortex_m:backend",
         "@pigweed//targets/rp2040:freertos_config_cv",
+        "@platforms//os:none",
 
         # For toolchain selection.
         "@platforms//cpu:armv6-m",
diff --git a/targets/stm32f429i_disc1_stm32cube/BUILD.bazel b/targets/stm32f429i_disc1_stm32cube/BUILD.bazel
index b6bdd04..3f905b0 100644
--- a/targets/stm32f429i_disc1_stm32cube/BUILD.bazel
+++ b/targets/stm32f429i_disc1_stm32cube/BUILD.bazel
@@ -26,6 +26,7 @@
         "@pigweed//pw_interrupt_cortex_m:backend",
         "@pigweed//targets/stm32f429i_disc1_stm32cube:freertos_config_cv",
         "@pigweed//pw_sys_io_stm32cube:backend",
+        "@platforms//os:none",
 
         # For toolchain selection.
         "@platforms//cpu:armv7e-m",