diff --git a/builder/family/beken-72xx.py b/builder/family/beken-72xx.py
index 12cef25..dc1038f 100644
--- a/builder/family/beken-72xx.py
+++ b/builder/family/beken-72xx.py
@@ -538,7 +538,7 @@ image_app_rblh = "${BUILD_DIR}/image_${MCULC}_app.${FLASH_RBL_OFFSET}.rblh"
 image_ota_rbl = "${BUILD_DIR}/image_${MCULC}_app.ota.rbl"
 env.Replace(
     # linker command (encryption + packaging)
-    LINK="${LTCHIPTOOL} link2bin ${BOARD_JSON} '' ''",
+    LINK='${LTCHIPTOOL} link2bin ${BOARD_JSON} "" ""',
     # UF2OTA input list
     UF2OTA=[
         # app binary image (enc+crc) for flasher
diff --git a/builder/family/realtek-ambz2.py b/builder/family/realtek-ambz2.py
index 28e3320..14aff21 100644
--- a/builder/family/realtek-ambz2.py
+++ b/builder/family/realtek-ambz2.py
@@ -418,7 +418,7 @@ queue.BuildLibraries()
 image_firmware_is = "${BUILD_DIR}/image_firmware_is.${FLASH_OTA1_OFFSET}.bin"
 env.Replace(
     # linker command (dual .bin outputs)
-    LINK="${LTCHIPTOOL} link2bin ${BOARD_JSON} '' ''",
+    LINK='${LTCHIPTOOL} link2bin ${BOARD_JSON} "" ""',
     # UF2OTA input list
     UF2OTA=[
         # same OTA images for flasher and device