diff --git a/core/Makefile b/core/Makefile
index c840ca8..cd96630 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -775,6 +775,11 @@
 .PHONY: otapackage
 otapackage: $(INTERNAL_OTA_PACKAGE_TARGET)
 
+# Keys authorized to sign OTA packages this build will accept.  The
+# build always uses test-keys for this; release packaging tools will
+# substitute other keys for this one.
+OTA_PUBLIC_KEYS := $(SRC_TARGET_DIR)/product/security/testkey.x509.pem
+
 # Build a keystore with the authorized keys in it.
 # java/android/android/server/checkin/UpdateVerifier.java uses this.
 ALL_DEFAULT_INSTALLED_MODULES += $(TARGET_OUT_ETC)/security/otacerts.zip