diff --git a/tools/ci/docker/linux/Dockerfile b/tools/ci/docker/linux/Dockerfile
index 967ec06210..43ae861243 100644
--- a/tools/ci/docker/linux/Dockerfile
+++ b/tools/ci/docker/linux/Dockerfile
@@ -308,7 +308,7 @@ ENV PATH="/tools/rust/cargo/bin:$PATH"
 
 # ARM toolchain
 COPY --from=nuttx-toolchain-arm /tools/clang-arm-none-eabi/ clang-arm-none-eabi/
-CMD cp /usr/bin/clang-extdef-mapping-10 clang-arm-none-eabi/bin/clang-extdef-mapping
+RUN cp /usr/bin/clang-extdef-mapping-10 clang-arm-none-eabi/bin/clang-extdef-mapping
 ENV PATH="/tools/clang-arm-none-eabi/bin:$PATH"
 
 COPY --from=nuttx-toolchain-arm /tools/gcc-arm-none-eabi/ gcc-arm-none-eabi/