diff --git a/java/com/facebook/soloader/SoLoader.java b/java/com/facebook/soloader/SoLoader.java
index 949c59c..9707915 100644
--- a/java/com/facebook/soloader/SoLoader.java
+++ b/java/com/facebook/soloader/SoLoader.java
@@ -778,10 +778,10 @@ public static boolean loadLibrary(String shortName, int loadFlags) throws Unsati
   @SuppressLint({"CatchGeneralException", "EmptyCatchBlock"})
   private static boolean loadLibraryOnAndroid(String shortName, int loadFlags) {
     @Nullable Throwable failure = null;
-    ObserverHolder.onLoadLibraryStart(shortName, loadFlags);
     try {
       String mergedLibName = MergedSoMapping.mapLibName(shortName);
       String soName = mergedLibName != null ? mergedLibName : shortName;
+      ObserverHolder.onLoadLibraryStart(shortName, mergedLibName, loadFlags);
       return loadLibraryBySoName(
           System.mapLibraryName(soName), shortName, mergedLibName, loadFlags, null);
     } catch (Throwable t) {
diff --git a/java/com/facebook/soloader/observer/Observer.java b/java/com/facebook/soloader/observer/Observer.java
index 0579664..da9e75e 100644
--- a/java/com/facebook/soloader/observer/Observer.java
+++ b/java/com/facebook/soloader/observer/Observer.java
@@ -22,7 +22,7 @@
 import javax.annotation.Nullable;
 
 public interface Observer {
-  void onLoadLibraryStart(String library, int flags);
+  void onLoadLibraryStart(String library, @Nullable String mergedLibrary, int flags);
 
   void onLoadLibraryEnd(@Nullable Throwable t);
 
diff --git a/java/com/facebook/soloader/observer/ObserverHolder.java b/java/com/facebook/soloader/observer/ObserverHolder.java
index 02bf113..a8390bb 100644
--- a/java/com/facebook/soloader/observer/ObserverHolder.java
+++ b/java/com/facebook/soloader/observer/ObserverHolder.java
@@ -45,11 +45,11 @@ public static void addObserver(Observer newObserver) {
     } while (!sObservers.compareAndSet(oldObservers, newObservers));
   }
 
-  public static void onLoadLibraryStart(String library, int flags) {
+  public static void onLoadLibraryStart(String library, @Nullable String mergedLibrary, int flags) {
     Observer[] observers = sObservers.get();
     if (observers != null) {
       for (Observer observer : observers) {
-        observer.onLoadLibraryStart(library, flags);
+        observer.onLoadLibraryStart(library, mergedLibrary, flags);
       }
     }
   }