diff --git a/soc/silabs/silabs_siwx91x/CMakeLists.txt b/soc/silabs/silabs_siwx91x/CMakeLists.txt
index 7997c79d4a9..8ec7c16aef2 100644
--- a/soc/silabs/silabs_siwx91x/CMakeLists.txt
+++ b/soc/silabs/silabs_siwx91x/CMakeLists.txt
@@ -1,5 +1,6 @@
-# Copyright (c) 2024 Silicon Laboratories Inc.
+# Copyright (c) 2024-2025 Silicon Laboratories Inc.
 # SPDX-License-Identifier: Apache-2.0
+include(west)
 
 add_subdirectory(siwg917)
 
@@ -12,5 +13,18 @@ set_property(GLOBAL APPEND PROPERTY extra_post_build_commands
     ${KERNEL_BIN_NAME}
     ${KERNEL_BIN_NAME}.rps
 )
+
 # runners_yaml_props_target controls the file used by "west flash"
-set_target_properties(runners_yaml_props_target PROPERTIES bin_file ${PROJECT_BINARY_DIR}/${KERNEL_BIN_NAME}.rps)
+if(CONFIG_SIWX91X_SIGN_KEY OR CONFIG_SIWX91X_MIC_KEY)
+  set_property(GLOBAL APPEND PROPERTY extra_post_build_commands
+    COMMAND ${CMAKE_COMMAND} -E env ZEPHYR_BASE=${ZEPHYR_BASE}
+    ${WEST} sign -t silabs_commander --build-dir ${CMAKE_BINARY_DIR}
+  )
+  set_target_properties(runners_yaml_props_target
+    PROPERTIES bin_file ${PROJECT_BINARY_DIR}/${KERNEL_NAME}.signed.bin.rps
+  )
+else()
+  set_target_properties(runners_yaml_props_target
+    PROPERTIES bin_file ${PROJECT_BINARY_DIR}/${KERNEL_BIN_NAME}.rps
+  )
+endif()