diff --git a/media/libeffects/preprocessing/Android.bp b/media/libeffects/preprocessing/Android.bp
index eb3ce34..37b2ae0 100644
--- a/media/libeffects/preprocessing/Android.bp
+++ b/media/libeffects/preprocessing/Android.bp
@@ -22,6 +22,7 @@
     name: "libaudiopreprocessing",
     vendor: true,
     relative_install_path: "soundfx",
+    host_supported: true,
     srcs: ["PreProcessing.cpp"],
     local_include_dirs: [
         ".",
diff --git a/media/libeffects/preprocessing/PreProcessing.cpp b/media/libeffects/preprocessing/PreProcessing.cpp
index 03ccc34..6c56686 100644
--- a/media/libeffects/preprocessing/PreProcessing.cpp
+++ b/media/libeffects/preprocessing/PreProcessing.cpp
@@ -670,8 +670,8 @@
     return 0;
 }
 
-int NsGetParameter(preproc_effect_t* effect __unused, void* pParam __unused,
-                   uint32_t* pValueSize __unused, void* pValue __unused) {
+int NsGetParameter(preproc_effect_t* /*effect __unused*/, void* /*pParam __unused*/,
+                   uint32_t* /*pValueSize __unused*/, void* /*pValue __unused*/) {
     int status = 0;
     return status;
 }
@@ -1551,7 +1551,7 @@
 }
 
 int PreProcessingFx_ProcessReverse(effect_handle_t self, audio_buffer_t* inBuffer,
-                                   audio_buffer_t* outBuffer __unused) {
+                                   audio_buffer_t* outBuffer) {
     preproc_effect_t* effect = (preproc_effect_t*)self;
 
     if (effect == NULL) {
diff --git a/media/libeffects/preprocessing/tests/Android.bp b/media/libeffects/preprocessing/tests/Android.bp
index 8848e79..806bc2b 100644
--- a/media/libeffects/preprocessing/tests/Android.bp
+++ b/media/libeffects/preprocessing/tests/Android.bp
@@ -13,6 +13,8 @@
 cc_test {
     name: "AudioPreProcessingTest",
     vendor: true,
+    host_supported: true,
+    gtest: false,
     srcs: ["PreProcessingTest.cpp"],
     shared_libs: [
         "libaudioutils",
@@ -27,7 +29,6 @@
         "libaudioeffects",
         "libhardware_headers",
     ],
-    gtest: false,
 }
 
 cc_test {