diff --git a/power.cpp b/power.cpp
index e9b6ccd..74abac9 100644
--- a/power.cpp
+++ b/power.cpp
@@ -44,6 +44,7 @@ int acquire_wake_lock(int, const char* id) {
     ATRACE_CALL();
     const auto& suspendService = getSystemSuspendServiceOnce();
     if (!suspendService) {
+        LOG(ERROR) << "ISystemSuspend::getService() failed.";
         return -1;
     }
 
diff --git a/power_test.cpp b/power_test.cpp
index 601df64..1ade263 100644
--- a/power_test.cpp
+++ b/power_test.cpp
@@ -73,8 +73,10 @@ TEST(LibpowerTest, WakeLockStressTest) {
             for (int j = 0; j < numLocks; j++) {
                 // We want ids to be unique.
                 std::string id = std::to_string(i) + "/" + std::to_string(j);
-                ASSERT_EQ(acquire_wake_lock(PARTIAL_WAKE_LOCK, id.c_str()), 0);
-                ASSERT_EQ(release_wake_lock(id.c_str()), 0);
+                ASSERT_EQ(acquire_wake_lock(PARTIAL_WAKE_LOCK, id.c_str()), 0)
+                    << "id: " << id;
+                ASSERT_EQ(release_wake_lock(id.c_str()), 0)
+                    << "id: " << id;;
             }
         });
     }