diff --git a/ui/build/ninja.go b/ui/build/ninja.go
index 6775ccf..8c6ebb8 100644
--- a/ui/build/ninja.go
+++ b/ui/build/ninja.go
@@ -114,6 +114,8 @@
 			"TARGET_BUILD_APPS",
 			"TARGET_BUILD_VARIANT",
 			"TARGET_PRODUCT",
+			// b/147197813 - used by art-check-debug-apex-gen
+			"EMMA_INSTRUMENT_FRAMEWORK",
 
 			// Goma -- gomacc may not need all of these
 			"GOMA_DIR",