diff --git a/sentry-android-core/src/main/java/io/sentry/android/core/performance/AppStartMetrics.java b/sentry-android-core/src/main/java/io/sentry/android/core/performance/AppStartMetrics.java
index d39b3ff5ac4..82376a75d8b 100644
--- a/sentry-android-core/src/main/java/io/sentry/android/core/performance/AppStartMetrics.java
+++ b/sentry-android-core/src/main/java/io/sentry/android/core/performance/AppStartMetrics.java
@@ -156,6 +156,7 @@ public AppStartMetrics() {
     return applicationOnCreate;
   }
 
+  @TestOnly
   public void setAppStartType(final @NotNull AppStartType appStartType) {
     this.appStartType = appStartType;
   }