diff --git a/libs/androidfw/AssetManager2.cpp b/libs/androidfw/AssetManager2.cpp
index 2864c68..1b32701 100644
--- a/libs/androidfw/AssetManager2.cpp
+++ b/libs/androidfw/AssetManager2.cpp
@@ -1417,6 +1417,18 @@
   return theme;
 }
 
+void AssetManager2::ForEachPackage(base::function_ref<bool(const std::string&, uint8_t)> func,
+                                   package_property_t excluded_property_flags) const {
+  for (const PackageGroup& package_group : package_groups_) {
+    const auto loaded_package = package_group.packages_.front().loaded_package_;
+    if ((loaded_package->GetPropertyFlags() & excluded_property_flags) == 0U
+        && !func(loaded_package->GetPackageName(),
+                 package_group.dynamic_ref_table->mAssignedPackageId)) {
+      return;
+    }
+  }
+}
+
 Theme::Theme(AssetManager2* asset_manager) : asset_manager_(asset_manager) {
 }
 
diff --git a/libs/androidfw/include/androidfw/AssetManager2.h b/libs/androidfw/include/androidfw/AssetManager2.h
index c933fb3..e4d1218 100644
--- a/libs/androidfw/include/androidfw/AssetManager2.h
+++ b/libs/androidfw/include/androidfw/AssetManager2.h
@@ -17,6 +17,7 @@
 #ifndef ANDROIDFW_ASSETMANAGER2_H_
 #define ANDROIDFW_ASSETMANAGER2_H_
 
+#include "android-base/function_ref.h"
 #include "android-base/macros.h"
 
 #include <array>
@@ -320,17 +321,8 @@
   // Creates a new Theme from this AssetManager.
   std::unique_ptr<Theme> NewTheme();
 
-  void ForEachPackage(const std::function<bool(const std::string&, uint8_t)> func,
-                      package_property_t excluded_property_flags = 0U) const {
-    for (const PackageGroup& package_group : package_groups_) {
-      const auto loaded_package = package_group.packages_.front().loaded_package_;
-      if ((loaded_package->GetPropertyFlags() & excluded_property_flags) == 0U
-          && !func(loaded_package->GetPackageName(),
-                   package_group.dynamic_ref_table->mAssignedPackageId)) {
-        return;
-      }
-    }
-  }
+  void ForEachPackage(base::function_ref<bool(const std::string&, uint8_t)> func,
+                      package_property_t excluded_property_flags = 0U) const;
 
   void DumpToLog() const;