diff --git a/src/coreclr/nativeaot/Runtime.Base/src/System/Runtime/InternalCalls.cs b/src/coreclr/nativeaot/Runtime.Base/src/System/Runtime/InternalCalls.cs
index cd534cd29c01ba..d25dfcd400d6c3 100644
--- a/src/coreclr/nativeaot/Runtime.Base/src/System/Runtime/InternalCalls.cs
+++ b/src/coreclr/nativeaot/Runtime.Base/src/System/Runtime/InternalCalls.cs
@@ -101,7 +101,7 @@ internal static class InternalCalls
 
         [RuntimeImport(RuntimeLibrary, "RhpNewArrayFast")]
         [MethodImpl(MethodImplOptions.InternalCall)]
-        internal static extern unsafe object RhpNewArrayFast(MethodTable* pEEType, int length);
+        internal static extern unsafe object RhpNewArrayFast(MethodTable* pEEType, nint length);
 
 #if FEATURE_64BIT_ALIGNMENT
         [RuntimeImport(RuntimeLibrary, "RhpNewFastAlign8")]
@@ -114,7 +114,7 @@ internal static class InternalCalls
 
         [RuntimeImport(RuntimeLibrary, "RhpNewArrayFastAlign8")]
         [MethodImpl(MethodImplOptions.InternalCall)]
-        internal static extern unsafe object RhpNewArrayFastAlign8(MethodTable* pEEType, int length);
+        internal static extern unsafe object RhpNewArrayFastAlign8(MethodTable* pEEType, nint length);
 
         [RuntimeImport(RuntimeLibrary, "RhpNewFastMisalign")]
         [MethodImpl(MethodImplOptions.InternalCall)]
diff --git a/src/coreclr/nativeaot/Runtime.Base/src/System/Runtime/RuntimeExports.cs b/src/coreclr/nativeaot/Runtime.Base/src/System/Runtime/RuntimeExports.cs
index 3570b7e72cffc3..63a9a23f6e73aa 100644
--- a/src/coreclr/nativeaot/Runtime.Base/src/System/Runtime/RuntimeExports.cs
+++ b/src/coreclr/nativeaot/Runtime.Base/src/System/Runtime/RuntimeExports.cs
@@ -56,7 +56,7 @@ public static unsafe object RhNewObject(MethodTable* pEEType)
         }
 
         [RuntimeExport("RhNewArray")]
-        public static unsafe object RhNewArray(MethodTable* pEEType, int length)
+        public static unsafe object RhNewArray(MethodTable* pEEType, nint length)
         {
             Debug.Assert(pEEType->IsSzArray);
 
diff --git a/src/coreclr/nativeaot/Runtime/portable.cpp b/src/coreclr/nativeaot/Runtime/portable.cpp
index 46fe1fbb7f7d79..21fcbd2507984c 100644
--- a/src/coreclr/nativeaot/Runtime/portable.cpp
+++ b/src/coreclr/nativeaot/Runtime/portable.cpp
@@ -88,7 +88,7 @@ FCIMPL1(Object *, RhpNewFinalizable, MethodTable* pEEType)
 }
 FCIMPLEND
 
-FCIMPL2(Array *, RhpNewArrayFast, MethodTable * pArrayEEType, int numElements)
+FCIMPL2(Array *, RhpNewArrayFast, MethodTable * pArrayEEType, intptr_t numElements)
 {
     Thread * pCurThread = ThreadStore::GetCurrentThread();
     gc_alloc_context * acontext = pCurThread->GetAllocContext();
@@ -221,7 +221,7 @@ FCIMPL1(Object*, RhpNewFastMisalign, MethodTable* pEEType)
 }
 FCIMPLEND
 
-FCIMPL2(Array*, RhpNewArrayFastAlign8, MethodTable* pArrayEEType, int numElements)
+FCIMPL2(Array*, RhpNewArrayFastAlign8, MethodTable* pArrayEEType, intptr_t numElements)
 {
     Thread* pCurThread = ThreadStore::GetCurrentThread();
     gc_alloc_context* acontext = pCurThread->GetAllocContext();
diff --git a/src/coreclr/nativeaot/System.Private.CoreLib/src/System/Runtime/RuntimeImports.cs b/src/coreclr/nativeaot/System.Private.CoreLib/src/System/Runtime/RuntimeImports.cs
index a9f862c684ec5b..1663dda8e088a8 100644
--- a/src/coreclr/nativeaot/System.Private.CoreLib/src/System/Runtime/RuntimeImports.cs
+++ b/src/coreclr/nativeaot/System.Private.CoreLib/src/System/Runtime/RuntimeImports.cs
@@ -404,7 +404,7 @@ internal static IntPtr RhHandleAllocCrossReference(object value, IntPtr context)
 
         [MethodImpl(MethodImplOptions.InternalCall)]
         [RuntimeImport(RuntimeLibrary, "RhNewArray")]
-        internal static extern unsafe Array RhNewArray(MethodTable* pEEType, int length);
+        internal static extern unsafe Array RhNewArray(MethodTable* pEEType, nint length);
 
         [MethodImpl(MethodImplOptions.InternalCall)]
         [RuntimeImport(RuntimeLibrary, "RhNewVariableSizeObject")]
diff --git a/src/coreclr/nativeaot/Test.CoreLib/src/System/Runtime/RuntimeImports.cs b/src/coreclr/nativeaot/Test.CoreLib/src/System/Runtime/RuntimeImports.cs
index 7703d63dee84a0..09fea74227d5e6 100644
--- a/src/coreclr/nativeaot/Test.CoreLib/src/System/Runtime/RuntimeImports.cs
+++ b/src/coreclr/nativeaot/Test.CoreLib/src/System/Runtime/RuntimeImports.cs
@@ -78,7 +78,7 @@ internal static IntPtr RhGetModuleSection(TypeManagerHandle module, ReadyToRunSe
 
         [MethodImpl(MethodImplOptions.InternalCall)]
         [RuntimeImport(RuntimeLibrary, "RhNewArray")]
-        private static extern unsafe Array RhNewArray(MethodTable* pEEType, int length);
+        private static extern unsafe Array RhNewArray(MethodTable* pEEType, nint length);
 
         [MethodImpl(MethodImplOptions.InternalCall)]
         [RuntimeImport(RuntimeLibrary, "RhNewString")]