diff --git a/config/common.mk b/config/common.mk
index e8bb0ff..b3a0913 100644
--- a/config/common.mk
+++ b/config/common.mk
@@ -27,7 +27,7 @@
     vendor/bliss/prebuilt/common/bin/backuptool.functions:install/bin/backuptool.functions \
     vendor/bliss/prebuilt/common/bin/50-bliss.sh:$(TARGET_COPY_OUT_SYSTEM)/addon.d/50-bliss.sh
 
-ifneq ($(AB_OTA_PARTITIONS),)
+ifneq ($(strip $(AB_OTA_PARTITIONS) $(AB_OTA_POSTINSTALL_CONFIG)),)
 PRODUCT_COPY_FILES += \
     vendor/bliss/prebuilt/common/bin/backuptool_ab.sh:$(TARGET_COPY_OUT_SYSTEM)/bin/backuptool_ab.sh \
     vendor/bliss/prebuilt/common/bin/backuptool_ab.functions:$(TARGET_COPY_OUT_SYSTEM)/bin/backuptool_ab.functions \