diff --git a/packages/osc/src/osc-types.ts b/packages/osc/src/osc-types.ts
index c38fea4..de8084c 100644
--- a/packages/osc/src/osc-types.ts
+++ b/packages/osc/src/osc-types.ts
@@ -262,4 +262,27 @@ export const oscTypeConverterMap: { [key: string]: OSCTypeConverter } = {
       return [view.getBigInt64(0), buffer.subarray(8)];
     },
   },
+  d: {
+    toBuffer: (number) => {
+      if (typeof number === 'number') {
+        const view = new DataView(new ArrayBuffer(8));
+        view.setFloat64(0, number);
+        return new Uint8Array(view.buffer);
+      }
+      throw new TypeError('osc type d toBuffer called with non number value');
+    },
+    fromBuffer: (buffer) => {
+      if (buffer.length < 8) {
+        throw new Error('not enough bytes to read a osc float');
+      }
+      const view = new DataView(new ArrayBuffer(8));
+
+      buffer.subarray(0, 8).forEach((byte, index) => {
+        view.setUint8(index, byte);
+      });
+
+      const value = view.getFloat64(0);
+      return [value, buffer.subarray(8)];
+    },
+  },
 };
diff --git a/packages/osc/tests/message-decode.test.js b/packages/osc/tests/message-decode.test.js
index fbfebbb..b0298e5 100644
--- a/packages/osc/tests/message-decode.test.js
+++ b/packages/osc/tests/message-decode.test.js
@@ -58,6 +58,13 @@ const tests = [
     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: 'simple address float64 arg',
+    bytes: new Uint8Array([
+      47, 104, 101, 108, 108, 111, 0, 0, 44, 100, 0, 0, 0x40, 0x29, 0x87, 0xec, 0x82, 0x74, 0xb9, 0xe6,
+    ]),
+    expected: { address: '/hello', args: [{ type: 'd', value: 12.7654763 }] },
+  },
   {
     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 95919f3..d89b50f 100644
--- a/packages/osc/tests/message-encode.test.js
+++ b/packages/osc/tests/message-encode.test.js
@@ -53,6 +53,13 @@ const tests = [
     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: 'simple address float64 arg',
+    message: { address: '/hello', args: [{ type: 'd', value: 12.7654763 }] },
+    expected: new Uint8Array([
+      47, 104, 101, 108, 108, 111, 0, 0, 44, 100, 0, 0, 0x40, 0x29, 0x87, 0xec, 0x82, 0x74, 0xb9, 0xe6,
+    ]),
+  },
   {
     description: 'osc 1.0 spec example 1',
     message: { address: '/oscillator/4/frequency', args: [{ type: 'f', value: 440 }] },