diff --git a/ir/1.0/IConsumerIr.hal b/ir/1.0/IConsumerIr.hal
index f928c0e..f9e6316 100644
--- a/ir/1.0/IConsumerIr.hal
+++ b/ir/1.0/IConsumerIr.hal
@@ -28,7 +28,7 @@
      *
      * returns: true on success, false on error.
      */
-    transmit(int32_t carrierFreq, vec<int32_t> pattern, int32_t patternLen) generates (bool success);
+    transmit(int32_t carrierFreq, vec<int32_t> pattern) generates (bool success);
 
     /*
      * getCarrierFreqs() enumerates which frequencies the IR transmitter supports.
diff --git a/ir/1.0/default/ConsumerIr.cpp b/ir/1.0/default/ConsumerIr.cpp
index 763e09a..8cfb2e8 100644
--- a/ir/1.0/default/ConsumerIr.cpp
+++ b/ir/1.0/default/ConsumerIr.cpp
@@ -32,8 +32,8 @@
 }
 
 // Methods from ::android::hardware::consumerir::V1_0::IConsumerIr follow.
-Return<bool> ConsumerIr::transmit(int32_t carrierFreq, const hidl_vec<int32_t>& pattern, int32_t patternLen) {
-    return mDevice->transmit(mDevice, carrierFreq, pattern.data(), patternLen) == 0;
+Return<bool> ConsumerIr::transmit(int32_t carrierFreq, const hidl_vec<int32_t>& pattern) {
+    return mDevice->transmit(mDevice, carrierFreq, pattern.data(), pattern.size()) == 0;
 }
 
 Return<void> ConsumerIr::getCarrierFreqs(getCarrierFreqs_cb _hidl_cb) {
diff --git a/ir/1.0/default/ConsumerIr.h b/ir/1.0/default/ConsumerIr.h
index 527c577..1532183 100644
--- a/ir/1.0/default/ConsumerIr.h
+++ b/ir/1.0/default/ConsumerIr.h
@@ -40,7 +40,7 @@
 struct ConsumerIr : public IConsumerIr {
     ConsumerIr(consumerir_device_t *device);
     // Methods from ::android::hardware::ir::V1_0::IConsumerIr follow.
-    Return<bool> transmit(int32_t carrierFreq, const hidl_vec<int32_t>& pattern, int32_t patternLen) override;
+    Return<bool> transmit(int32_t carrierFreq, const hidl_vec<int32_t>& pattern) override;
     Return<void> getCarrierFreqs(getCarrierFreqs_cb _hidl_cb) override;
 private:
     consumerir_device_t *mDevice;