diff --git a/launchdarkly-android-client-sdk/src/main/java/com/launchdarkly/sdk/android/ConnectivityManager.java b/launchdarkly-android-client-sdk/src/main/java/com/launchdarkly/sdk/android/ConnectivityManager.java
index 0da74ca1..e660c5f6 100644
--- a/launchdarkly-android-client-sdk/src/main/java/com/launchdarkly/sdk/android/ConnectivityManager.java
+++ b/launchdarkly-android-client-sdk/src/main/java/com/launchdarkly/sdk/android/ConnectivityManager.java
@@ -193,7 +193,7 @@ void setEvaluationContext(@NonNull LDContext newContext, @NonNull Callback<Void>
         }
     }
 
-    private boolean updateDataSource(
+    private synchronized boolean updateDataSource(
             boolean mustReinitializeDataSource,
             @NonNull Callback<Void> onCompletion
     ) {