diff --git a/drm/drmserver/Android.mk b/drm/drmserver/Android.mk
index 9b15f93..3b8bb04 100644
--- a/drm/drmserver/Android.mk
+++ b/drm/drmserver/Android.mk
@@ -36,6 +36,8 @@
     $(TOP)/frameworks/av/drm/libdrmframework/include \
     $(TOP)/frameworks/av/drm/libdrmframework/plugins/common/include
 
+LOCAL_CFLAGS += -Wall -Wextra -Werror
+
 LOCAL_MODULE:= drmserver
 
 LOCAL_MODULE_TAGS := optional
diff --git a/drm/drmserver/DrmManagerService.cpp b/drm/drmserver/DrmManagerService.cpp
index 857d73e..814ffcc 100644
--- a/drm/drmserver/DrmManagerService.cpp
+++ b/drm/drmserver/DrmManagerService.cpp
@@ -51,8 +51,7 @@
 const char *DrmManagerService::get_perm_label(drm_perm_t perm) {
     unsigned int index = perm;
 
-    if (index < 0 ||
-            index >= (sizeof(drm_perm_labels) / sizeof(drm_perm_labels[0]))) {
+    if (index >= (sizeof(drm_perm_labels) / sizeof(drm_perm_labels[0]))) {
         ALOGE("SELinux: Failed to retrieve permission label(perm=%d).\n", perm);
         abort();
     }
@@ -338,7 +337,7 @@
     return mDrmManager->pread(uniqueId, decryptHandle, buffer, numBytes, offset);
 }
 
-status_t DrmManagerService::dump(int fd, const Vector<String16>& args)
+status_t DrmManagerService::dump(int fd, const Vector<String16>& /* args */)
 {
     const size_t SIZE = 256;
     char buffer[SIZE];