diff --git a/ReactAndroid/src/main/jni/react/jni/CatalystInstanceImpl.cpp b/ReactAndroid/src/main/jni/react/jni/CatalystInstanceImpl.cpp
index 4ce97ac87..1706e2d3e 100644
--- a/ReactAndroid/src/main/jni/react/jni/CatalystInstanceImpl.cpp
+++ b/ReactAndroid/src/main/jni/react/jni/CatalystInstanceImpl.cpp
@@ -207,32 +207,11 @@ void CatalystInstanceImpl::jniLoadScriptFromAssets(
   }
 }
 
-bool CatalystInstanceImpl::isIndexedRAMBundle(const char *sourcePath) {
-  std::ifstream bundle_stream(sourcePath, std::ios_base::in);
-  if (!bundle_stream) {
-    return false;
-  }
-  BundleHeader header;
-  bundle_stream.read(reinterpret_cast<char *>(&header), sizeof(header));
-  bundle_stream.close();
-  return parseTypeFromHeader(header) == ScriptTag::RAMBundle;
-}
-
 void CatalystInstanceImpl::jniLoadScriptFromFile(const std::string& fileName,
                                                  const std::string& sourceURL,
                                                  bool loadSynchronously) {
-  auto zFileName = fileName.c_str();
-  if (isIndexedRAMBundle(zFileName)) {
-    auto bundle = folly::make_unique<JSIndexedRAMBundle>(zFileName);
-    auto startupScript = bundle->getStartupCode();
-    auto registry = jsBundlesDirectory_.empty()
-      ? folly::make_unique<RAMBundleRegistry>(std::move(bundle))
-      : folly::make_unique<JSIndexedRAMBundleRegistry>(std::move(bundle), jsBundlesDirectory_);
-    instance_->loadRAMBundle(
-      std::move(registry),
-      std::move(startupScript),
-      sourceURL,
-      loadSynchronously);
+  if (Instance::isIndexedRAMBundle(fileName.c_str())) {
+    instance_->loadRAMBundleFromFile(fileName, sourceURL, loadSynchronously);
   } else {
     std::unique_ptr<const JSBigFileString> script;
     RecoverableError::runRethrowingAsRecoverable<std::system_error>(
diff --git a/ReactAndroid/src/main/jni/react/jni/CatalystInstanceImpl.h b/ReactAndroid/src/main/jni/react/jni/CatalystInstanceImpl.h
index 1c481a835..f1bd47e8e 100644
--- a/ReactAndroid/src/main/jni/react/jni/CatalystInstanceImpl.h
+++ b/ReactAndroid/src/main/jni/react/jni/CatalystInstanceImpl.h
@@ -40,8 +40,6 @@ class CatalystInstanceImpl : public jni::HybridClass<CatalystInstanceImpl> {
 
   CatalystInstanceImpl();
 
-  static bool isIndexedRAMBundle(const char *sourcePath);
-
   void initializeBridge(
       jni::alias_ref<ReactCallback::javaobject> callback,
       // This executor is actually a factory holder.
diff --git a/ReactCommon/cxxreact/Instance.cpp b/ReactCommon/cxxreact/Instance.cpp
index 04e86cc82..022680151 100644
--- a/ReactCommon/cxxreact/Instance.cpp
+++ b/ReactCommon/cxxreact/Instance.cpp
@@ -3,6 +3,7 @@
 #include "Instance.h"
 
 #include "JSBigString.h"
+#include "JSBundleType.h"
 #include "JSExecutor.h"
 #include "MessageQueueThread.h"
 #include "MethodCall.h"
@@ -11,6 +12,7 @@
 #include "RecoverableError.h"
 #include "SystraceSection.h"
 
+#include <cxxreact/JSIndexedRAMBundle.h>
 #include <folly/Memory.h>
 #include <folly/MoveWrapper.h>
 #include <folly/json.h>
@@ -18,6 +20,7 @@
 #include <glog/logging.h>
 
 #include <condition_variable>
+#include <fstream>
 #include <mutex>
 #include <string>
 
@@ -91,6 +94,31 @@ void Instance::loadScriptFromString(std::unique_ptr<const JSBigString> string,
   }
 }
 
+bool Instance::isIndexedRAMBundle(const char *sourcePath) {
+  std::ifstream bundle_stream(sourcePath, std::ios_base::in);
+  BundleHeader header;
+
+  if (!bundle_stream ||
+      !bundle_stream.read(reinterpret_cast<char *>(&header), sizeof(header))) {
+    return false;
+  }
+
+  return parseTypeFromHeader(header) == ScriptTag::RAMBundle;
+}
+
+void Instance::loadRAMBundleFromFile(const std::string& sourcePath,
+                           const std::string& sourceURL,
+                           bool loadSynchronously) {
+    auto bundle = folly::make_unique<JSIndexedRAMBundle>(sourcePath.c_str());
+    auto startupScript = bundle->getStartupCode();
+    auto registry = folly::make_unique<RAMBundleRegistry>(std::move(bundle));
+    loadRAMBundle(
+      std::move(registry),
+      std::move(startupScript),
+      sourceURL,
+      loadSynchronously);
+}
+
 void Instance::loadRAMBundle(std::unique_ptr<RAMBundleRegistry> bundleRegistry,
                              std::unique_ptr<const JSBigString> startupScript,
                              std::string startupScriptSourceURL,
diff --git a/ReactCommon/cxxreact/Instance.h b/ReactCommon/cxxreact/Instance.h
index 45ab52842..6999fb60d 100644
--- a/ReactCommon/cxxreact/Instance.h
+++ b/ReactCommon/cxxreact/Instance.h
@@ -44,6 +44,10 @@ public:
 
   void loadScriptFromString(std::unique_ptr<const JSBigString> string,
                             std::string sourceURL, bool loadSynchronously);
+  static bool isIndexedRAMBundle(const char *sourcePath);
+  void loadRAMBundleFromFile(const std::string& sourcePath,
+                             const std::string& sourceURL,
+                             bool loadSynchronously);
   void loadRAMBundle(std::unique_ptr<RAMBundleRegistry> bundleRegistry,
                      std::unique_ptr<const JSBigString> startupScript,
                      std::string startupScriptSourceURL, bool loadSynchronously);