diff --git a/benchmark/build.gradle b/benchmark/build.gradle
index f09b77536..61f8934fe 100644
--- a/benchmark/build.gradle
+++ b/benchmark/build.gradle
@@ -37,6 +37,7 @@ android {
             proguardFiles getDefaultProguardFile("proguard-android-optimize.txt"), "benchmark-proguard-rules.pro"
         }
         release {
+            isDefault = false
             minifyEnabled true
         }
         create("benchmark") {
diff --git a/quartz/build.gradle b/quartz/build.gradle
index faa2a62f2..2e0d0cf20 100644
--- a/quartz/build.gradle
+++ b/quartz/build.gradle
@@ -32,6 +32,7 @@ android {
     }
     kotlinOptions {
         jvmTarget = '17'
+        freeCompilerArgs += "-Xstring-concat=inline"
     }
 }
 
diff --git a/quartz/src/main/java/com/vitorpamplona/quartz/crypto/CryptoUtils.kt b/quartz/src/main/java/com/vitorpamplona/quartz/crypto/CryptoUtils.kt
index b48bb4d6d..1edc0d371 100644
--- a/quartz/src/main/java/com/vitorpamplona/quartz/crypto/CryptoUtils.kt
+++ b/quartz/src/main/java/com/vitorpamplona/quartz/crypto/CryptoUtils.kt
@@ -263,7 +263,7 @@ object CryptoUtils {
     }
   }
 
-  data class EncryptedInfoString(
+  class EncryptedInfoString(
     val ciphertext: String,
     val nonce: String,
     val v: Int,