diff --git a/target/board/BoardConfigMainlineCommon.mk b/target/board/BoardConfigMainlineCommon.mk
index 8d2957ce3..6c56671ee 100644
--- a/target/board/BoardConfigMainlineCommon.mk
+++ b/target/board/BoardConfigMainlineCommon.mk
@@ -41,3 +41,6 @@ AB_OTA_UPDATER := true
 
 # Enable system property split for Treble
 BOARD_PROPERTY_OVERRIDES_SPLIT_ENABLED := true
+
+# Generate an APEX image for experiment b/119800099.
+DEXPREOPT_GENERATE_APEX_IMAGE := true