diff --git a/apex/builder.go b/apex/builder.go
index 3c7671b..04658d9 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -231,7 +231,7 @@
 
 	apexSepolicyTestsRule = pctx.StaticRule("apexSepolicyTestsRule", blueprint.RuleParams{
 		Command: `${deapexer} --debugfs_path ${debugfs_static} list -Z ${in} > ${out}.fc` +
-			`&& ${apex_sepolicy_tests} -f ${out}.fc && touch ${out}`,
+			` && ${apex_sepolicy_tests} -f ${out}.fc && touch ${out}`,
 		CommandDeps: []string{"${apex_sepolicy_tests}", "${deapexer}", "${debugfs_static}"},
 		Description: "run apex_sepolicy_tests",
 	})
@@ -876,7 +876,8 @@
 		args["outCommaList"] = signedOutputFile.String()
 	}
 	var validations android.Paths
-	if suffix == imageApexSuffix {
+	// TODO(b/279688635) deapexer supports [ext4]
+	if suffix == imageApexSuffix && ext4 == a.payloadFsType {
 		validations = append(validations, runApexSepolicyTests(ctx, unsignedOutputFile.OutputPath))
 	}
 	ctx.Build(pctx, android.BuildParams{