diff --git a/app/src/main/java/uk/gov/android/authentication/integrity/appcheck/AppChecker.kt b/app/src/main/java/uk/gov/android/authentication/integrity/appcheck/AppChecker.kt
index ad3eefa..e0b5f14 100644
--- a/app/src/main/java/uk/gov/android/authentication/integrity/appcheck/AppChecker.kt
+++ b/app/src/main/java/uk/gov/android/authentication/integrity/appcheck/AppChecker.kt
@@ -6,5 +6,5 @@ import uk.gov.android.authentication.integrity.model.AppCheckToken
 interface AppChecker {
     fun init(context: Context)
 
-    fun getAppCheckToken(): Result<AppCheckToken>
+    suspend fun getAppCheckToken(): Result<AppCheckToken>
 }
diff --git a/app/src/main/java/uk/gov/android/authentication/integrity/usecase/AttestationCaller.kt b/app/src/main/java/uk/gov/android/authentication/integrity/usecase/AttestationCaller.kt
index a86d7f7..220f6f1 100644
--- a/app/src/main/java/uk/gov/android/authentication/integrity/usecase/AttestationCaller.kt
+++ b/app/src/main/java/uk/gov/android/authentication/integrity/usecase/AttestationCaller.kt
@@ -11,6 +11,6 @@ fun interface AttestationCaller {
     data class Response(val jwt: String, val expiresIn: Long)
 
     companion object {
-        protected const val FIREBASE_HEADER = "X-Firebase-AppCheck"
+        const val FIREBASE_HEADER = "X-Firebase-AppCheck"
     }
 }