diff --git a/hal/Android.mk b/hal/Android.mk
index 1bd1342..faf632c 100644
--- a/hal/Android.mk
+++ b/hal/Android.mk
@@ -359,6 +359,12 @@
     LOCAL_SHARED_LIBRARIES += vendor.qti.hardware.audiohalext@1.0
 endif
 
+ifeq ($(strip $(AUDIO_FEATURE_ENABLED_EXT_AMPLIFIER)),true)
+    LOCAL_CFLAGS += -DEXT_AMPLIFIER_ENABLED
+    LOCAL_SRC_FILES += audio_extn/audio_amplifier.c
+    LOCAL_SHARED_LIBRARIES += libhardware
+endif
+
 LOCAL_CFLAGS += -D_GNU_SOURCE
 LOCAL_CFLAGS += -Wall -Werror