diff --git a/build_library/build_image_util.sh b/build_library/build_image_util.sh
index 55f8f783d4..bbb80dcb6d 100755
--- a/build_library/build_image_util.sh
+++ b/build_library/build_image_util.sh
@@ -693,7 +693,7 @@ EOF
 
   if [[ -n "${pcr_policy}" ]]; then
     mkdir -p "${BUILD_DIR}/pcrs"
-    ${BUILD_LIBRARY_DIR}/generate_kernel_hash.sh \
+    ${BUILD_LIBRARY_DIR}/generate_kernel_hash.py \
         "${root_fs_dir}/boot/flatcar/vmlinuz-a" ${FLATCAR_VERSION} \
         >"${BUILD_DIR}/pcrs/kernel.config"
   fi
diff --git a/build_library/generate_kernel_hash.sh b/build_library/generate_kernel_hash.py
similarity index 100%
rename from build_library/generate_kernel_hash.sh
rename to build_library/generate_kernel_hash.py