diff --git a/core/config.mk b/core/config.mk
index b3a204b..b3f3d36 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -190,6 +190,12 @@
 endif
 
 # ###############################################################
+# Broken build defaults
+# ###############################################################
+# Assume that all boards have duplicate rules right now.
+BUILD_BROKEN_DUP_RULES := true
+
+# ###############################################################
 # Include sub-configuration files
 # ###############################################################
 
diff --git a/target/board/generic/BoardConfig.mk b/target/board/generic/BoardConfig.mk
index 70c78a8..9bf3c8b 100644
--- a/target/board/generic/BoardConfig.mk
+++ b/target/board/generic/BoardConfig.mk
@@ -69,4 +69,6 @@
 TARGET_NO_RECOVERY := true
 BOARD_BUILD_SYSTEM_ROOT_IMAGE := true
 
-BOARD_VNDK_VERSION := current
\ No newline at end of file
+BOARD_VNDK_VERSION := current
+
+BUILD_BROKEN_DUP_RULES := false
diff --git a/target/board/generic_arm64/BoardConfig.mk b/target/board/generic_arm64/BoardConfig.mk
index be8ea39..dbdec90 100644
--- a/target/board/generic_arm64/BoardConfig.mk
+++ b/target/board/generic_arm64/BoardConfig.mk
@@ -101,3 +101,5 @@
 BOARD_BUILD_SYSTEM_ROOT_IMAGE := true
 
 BOARD_VNDK_VERSION := current
+
+BUILD_BROKEN_DUP_RULES := false
diff --git a/target/board/generic_mips64/BoardConfig.mk b/target/board/generic_mips64/BoardConfig.mk
index 2052d7b..fa4c355 100644
--- a/target/board/generic_mips64/BoardConfig.mk
+++ b/target/board/generic_mips64/BoardConfig.mk
@@ -91,3 +91,5 @@
 # Enable A/B update
 TARGET_NO_RECOVERY := true
 BOARD_BUILD_SYSTEM_ROOT_IMAGE := true
+
+BUILD_BROKEN_DUP_RULES := false
diff --git a/target/board/generic_x86/BoardConfig.mk b/target/board/generic_x86/BoardConfig.mk
index f71e72b..3760cc4 100644
--- a/target/board/generic_x86/BoardConfig.mk
+++ b/target/board/generic_x86/BoardConfig.mk
@@ -63,6 +63,8 @@
 
 BOARD_VNDK_VERSION := current
 
+BUILD_BROKEN_DUP_RULES := false
+
 # Enable A/B update
 TARGET_NO_RECOVERY := true
 BOARD_BUILD_SYSTEM_ROOT_IMAGE := true
diff --git a/target/board/generic_x86_64/BoardConfig.mk b/target/board/generic_x86_64/BoardConfig.mk
index a9c5142..ec7a51e 100755
--- a/target/board/generic_x86_64/BoardConfig.mk
+++ b/target/board/generic_x86_64/BoardConfig.mk
@@ -65,3 +65,5 @@
 # Enable A/B update
 TARGET_NO_RECOVERY := true
 BOARD_BUILD_SYSTEM_ROOT_IMAGE := true
+
+BUILD_BROKEN_DUP_RULES := false
diff --git a/target/board/treble_common.mk b/target/board/treble_common.mk
index a8c9bc5..187022e 100644
--- a/target/board/treble_common.mk
+++ b/target/board/treble_common.mk
@@ -58,3 +58,5 @@
 $(error BOARD_AVB_ENABLE cannot be set for Treble GSI)
 endif
 BOARD_BUILD_DISABLED_VBMETAIMAGE := true
+
+BUILD_BROKEN_DUP_RULES := false