diff --git a/packages/osc/src/models.ts b/packages/osc/src/models.ts
index 6d339d1..e7a5c69 100644
--- a/packages/osc/src/models.ts
+++ b/packages/osc/src/models.ts
@@ -1,7 +1,7 @@
 export type OSCType = 's' | 'i' | 'f' | 'b' | 'T' | 'F' | 't' | 'r' | 'N';
 export type OSCArg = {
   type: OSCType;
-  value: string | number | Uint8Array | boolean | OSCTimeTag | OSCColor | null;
+  value: string | number | Uint8Array | boolean | OSCTimeTag | OSCColor | bigint | null;
 };
 
 export type OSCTimeTag = [number, number];
@@ -24,8 +24,10 @@ export type OSCMessage = {
 };
 
 export type OSCTypeConverter = {
-  toBuffer: (value: string | number | Uint8Array | boolean | OSCTimeTag | OSCColor | null) => Uint8Array | undefined;
+  toBuffer: (
+    value: string | number | Uint8Array | boolean | OSCTimeTag | OSCColor | null | bigint
+  ) => Uint8Array | undefined;
   fromBuffer: (
     buffer: Uint8Array
-  ) => [string | number | Uint8Array | boolean | OSCTimeTag | OSCColor | null | undefined, Uint8Array];
+  ) => [string | number | Uint8Array | boolean | OSCTimeTag | OSCColor | null | bigint | undefined, Uint8Array];
 };
diff --git a/packages/osc/src/osc-types.ts b/packages/osc/src/osc-types.ts
index a7732c7..613c2bc 100644
--- a/packages/osc/src/osc-types.ts
+++ b/packages/osc/src/osc-types.ts
@@ -236,4 +236,32 @@ export const oscTypeConverterMap: { [key: string]: OSCTypeConverter } = {
       return [Number.MAX_SAFE_INTEGER, buffer];
     },
   },
+  h: {
+    toBuffer: (number) => {
+      const view = new DataView(new ArrayBuffer(8));
+
+      if (typeof number === 'number') {
+        view.setBigInt64(0, BigInt(number));
+      } else if (typeof number === 'bigint') {
+        view.setBigInt64(0, number);
+      } else {
+        throw new TypeError('osc type h toBuffer called with non number or bigint value');
+      }
+      return new Uint8Array(view.buffer);
+    },
+    fromBuffer: (buffer) => {
+      if (buffer.length < 8) {
+        throw new Error('osc int64 must be at least 8 bytes');
+      }
+
+
+      
+      const view = new DataView(new ArrayBuffer(8));
+      buffer.subarray(0,8).forEach((byte, index)=>{
+        view.setUint8(index,byte)
+      })
+
+      return [view.getBigInt64(0), buffer.subarray(8)];
+    },
+  },
 };
diff --git a/packages/osc/tests/message-decode.test.js b/packages/osc/tests/message-decode.test.js
index 736277a..fbfebbb 100644
--- a/packages/osc/tests/message-decode.test.js
+++ b/packages/osc/tests/message-decode.test.js
@@ -53,6 +53,11 @@ const tests = [
     bytes: new Uint8Array([47, 104, 101, 108, 108, 111, 0, 0, 44, 73, 0, 0]),
     expected: { address: '/hello', args: [{ type: 'I', value: Number.MAX_SAFE_INTEGER }] },
   },
+  {
+    description: 'simple address int64 arg',
+    bytes: new Uint8Array([47, 104, 101, 108, 108, 111, 0, 0, 44, 104, 0, 0, 0, 0, 255, 255, 255, 255, 255, 255]),
+    expected: { address: '/hello', args: [{ type: 'h', value: 281474976710655n }] },
+  },
   {
     description: 'osc 1.0 spec example 1',
     bytes: new Uint8Array([
diff --git a/packages/osc/tests/message-encode.test.js b/packages/osc/tests/message-encode.test.js
index f39c58a..95919f3 100644
--- a/packages/osc/tests/message-encode.test.js
+++ b/packages/osc/tests/message-encode.test.js
@@ -48,6 +48,11 @@ const tests = [
     message: { address: '/hello', args: [{ type: 'N', value: null }] },
     expected: new Uint8Array([47, 104, 101, 108, 108, 111, 0, 0, 44, 78, 0, 0]),
   },
+  {
+    description: 'simple address int64 arg',
+    message: { address: '/hello', args: [{ type: 'h', value: 281474976710655n }] },
+    expected: new Uint8Array([47, 104, 101, 108, 108, 111, 0, 0, 44, 104, 0, 0, 0, 0, 255, 255, 255, 255, 255, 255]),
+  },
   {
     description: 'osc 1.0 spec example 1',
     message: { address: '/oscillator/4/frequency', args: [{ type: 'f', value: 440 }] },