diff --git a/index.js b/index.js
index f96dd56..f80edea 100644
--- a/index.js
+++ b/index.js
@@ -49,12 +49,24 @@ class I2CPort {
             read16: cmd => bus.readWord(slaveAddress, cmd).catch(error => {
                 throw new OperationError(error);
             }),
-            write8: (cmd, byte) => bus.writeByte(slaveAddress, cmd, byte).catch(error => {
-                throw new OperationError(error);
-            }),
-            write16: (cmd, word) => bus.writeWord(slaveAddress, cmd, word).catch(error => {
-                throw new OperationError(error);
-            }),
+            write8: async (cmd, byte) => {
+                try {
+                    await bus.writeByte(slaveAddress, cmd, byte);
+                    return byte;
+                }
+                catch (error) {
+                    throw new OperationError(error);
+                }
+            },
+            write16: async (cmd, word) => {
+                try {
+                    await bus.writeWord(slaveAddress, cmd, word);
+                    return word;
+                }
+                catch (error) {
+                    throw new OperationError(error);
+                }
+            },
             /** Different from Web I2C API specification. */
             readByte: async () => {
                 try {
diff --git a/index.ts b/index.ts
index 7af2cf4..ead9751 100644
--- a/index.ts
+++ b/index.ts
@@ -65,14 +65,22 @@ export class I2CPort {
         bus.readWord(slaveAddress, cmd).catch(error => {
           throw new OperationError(error);
         }),
-      write8: (cmd, byte) =>
-        bus.writeByte(slaveAddress, cmd, byte).catch(error => {
+      write8: async (cmd, byte) => {
+        try {
+          await bus.writeByte(slaveAddress, cmd, byte);
+          return byte;
+        } catch (error) {
           throw new OperationError(error);
-        }),
-      write16: (cmd, word) =>
-        bus.writeWord(slaveAddress, cmd, word).catch(error => {
+        }
+      },
+      write16: async (cmd, word) => {
+        try {
+          await bus.writeWord(slaveAddress, cmd, word);
+          return word;
+        } catch (error) {
           throw new OperationError(error);
-        }),
+        }
+      },
 
       /** Different from Web I2C API specification. */
       readByte: async () => {