diff --git a/core/soong_app_prebuilt.mk b/core/soong_app_prebuilt.mk
index a9169eb..9e75ccb 100644
--- a/core/soong_app_prebuilt.mk
+++ b/core/soong_app_prebuilt.mk
@@ -129,7 +129,15 @@
 my_2nd_arch_prefix :=
 
 PACKAGES := $(PACKAGES) $(LOCAL_MODULE)
-ifdef LOCAL_CERTIFICATE
+ifeq ($(LOCAL_CERTIFICATE),PRESIGNED)
+  # The magic string "PRESIGNED" means this package is already checked
+  # signed with its release key.
+  #
+  # By setting .CERTIFICATE but not .PRIVATE_KEY, this package will be
+  # mentioned in apkcerts.txt (with certificate set to "PRESIGNED")
+  # but the dexpreopt process will not try to re-sign the app.
+  PACKAGES.$(LOCAL_MODULE).CERTIFICATE := PRESIGNED
+else ifneq ($(LOCAL_CERTIFICATE),)
   PACKAGES.$(LOCAL_MODULE).CERTIFICATE := $(LOCAL_CERTIFICATE)
   PACKAGES.$(LOCAL_MODULE).PRIVATE_KEY := $(patsubst %.x509.pem,%.pk8,$(LOCAL_CERTIFICATE))
 endif