diff --git a/java/app_import.go b/java/app_import.go
index f044c68..8951c7d 100644
--- a/java/app_import.go
+++ b/java/app_import.go
@@ -97,7 +97,7 @@
 
 	// The name of a certificate in the default certificate directory or an android_app_certificate
 	// module name in the form ":module". Should be empty if presigned or default_dev_cert is set.
-	Certificate *string
+	Certificate proptools.Configurable[string] `android:"replace_instead_of_append"`
 
 	// Names of extra android_app_certificate modules to sign the apk with in the form ":module".
 	Additional_certificates []string
@@ -240,7 +240,7 @@
 }
 
 func (a *AndroidAppImport) DepsMutator(ctx android.BottomUpMutatorContext) {
-	cert := android.SrcIsModule(String(a.properties.Certificate))
+	cert := android.SrcIsModule(a.properties.Certificate.GetOrDefault(ctx, ""))
 	if cert != "" {
 		ctx.AddDependency(ctx.Module(), certificateTag, cert)
 	}
@@ -323,7 +323,7 @@
 	}
 
 	numCertPropsSet := 0
-	if String(a.properties.Certificate) != "" {
+	if a.properties.Certificate.GetOrDefault(ctx, "") != "" {
 		numCertPropsSet++
 	}
 	if Bool(a.properties.Presigned) {
@@ -406,7 +406,7 @@
 		// If the certificate property is empty at this point, default_dev_cert must be set to true.
 		// Which makes processMainCert's behavior for the empty cert string WAI.
 		_, _, certificates := collectAppDeps(ctx, a, false, false)
-		a.certificate, certificates = processMainCert(a.ModuleBase, String(a.properties.Certificate), certificates, ctx)
+		a.certificate, certificates = processMainCert(a.ModuleBase, a.properties.Certificate.GetOrDefault(ctx, ""), certificates, ctx)
 		signed := android.PathForModuleOut(ctx, "signed", apkFilename)
 		var lineageFile android.Path
 		if lineage := String(a.properties.Lineage); lineage != "" {