diff --git a/java/jni/YGJNIVanilla.cpp b/java/jni/YGJNIVanilla.cpp
index 3503be40..71fe98f3 100644
--- a/java/jni/YGJNIVanilla.cpp
+++ b/java/jni/YGJNIVanilla.cpp
@@ -367,11 +367,7 @@ static void jni_YGNodeCalculateLayoutJNI(
     void* layoutContext = nullptr;
     auto map = PtrJNodeMapVanilla{};
     if (nativePointers) {
-      size_t nativePointersSize = env->GetArrayLength(nativePointers);
-      jlong result[nativePointersSize];
-      env->GetLongArrayRegion(nativePointers, 0, nativePointersSize, result);
-
-      map = PtrJNodeMapVanilla{result, nativePointersSize, javaNodes};
+      map = PtrJNodeMapVanilla{nativePointers, javaNodes};
       layoutContext = ↦
     }
 
diff --git a/java/jni/YGJTypesVanilla.h b/java/jni/YGJTypesVanilla.h
index 8f8c7786..d1202b75 100644
--- a/java/jni/YGJTypesVanilla.h
+++ b/java/jni/YGJTypesVanilla.h
@@ -20,11 +20,15 @@ class PtrJNodeMapVanilla {
 
 public:
   PtrJNodeMapVanilla() : ptrsToIdxs_{}, javaNodes_{} {}
-  PtrJNodeMapVanilla(
-      jlong* nativePointers,
-      size_t nativePointersSize,
-      jobjectArray javaNodes)
+  PtrJNodeMapVanilla(jlongArray javaNativePointers, jobjectArray javaNodes)
       : javaNodes_{javaNodes} {
+
+    JNIEnv* env = getCurrentEnv();
+    size_t nativePointersSize = env->GetArrayLength(javaNativePointers);
+    std::vector<jlong> nativePointers(nativePointersSize);
+    env->GetLongArrayRegion(
+        javaNativePointers, 0, nativePointersSize, nativePointers.data());
+
     for (size_t i = 0; i < nativePointersSize; ++i) {
       ptrsToIdxs_[(YGNodeRef) nativePointers[i]] = i;
     }