diff --git a/post_proc/Android.mk b/post_proc/Android.mk
index 493f2cc..f1174a0 100644
--- a/post_proc/Android.mk
+++ b/post_proc/Android.mk
@@ -30,6 +30,8 @@
 	external/tinyalsa/include \
 	$(call include-path-for, audio-effects)
 
+LOCAL_HEADER_LIBRARIES += libhardware_headers
+LOCAL_HEADER_LIBRARIES += libsystem_headers
 include $(BUILD_SHARED_LIBRARY)
 endif
 
@@ -60,6 +62,8 @@
         hardware/qcom/audio/hal \
 	$(call include-path-for, audio-effects)
 
+LOCAL_HEADER_LIBRARIES += libhardware_headers
+LOCAL_HEADER_LIBRARIES += libsystem_headers
 include $(BUILD_SHARED_LIBRARY)
 
 endif
diff --git a/visualizer/Android.mk b/visualizer/Android.mk
index e318214..29a093e 100644
--- a/visualizer/Android.mk
+++ b/visualizer/Android.mk
@@ -36,4 +36,5 @@
 	external/tinyalsa/include \
 	$(call include-path-for, audio-effects)
 
+LOCAL_HEADER_LIBRARIES += libsystem_headers
 include $(BUILD_SHARED_LIBRARY)
diff --git a/voice_processing/Android.mk b/voice_processing/Android.mk
index e8878ee..7ebeb70 100644
--- a/voice_processing/Android.mk
+++ b/voice_processing/Android.mk
@@ -23,4 +23,5 @@
 
 LOCAL_CFLAGS += -fvisibility=hidden
 
+LOCAL_HEADER_LIBRARIES += libhardware_headers
 include $(BUILD_SHARED_LIBRARY)