diff --git a/src/common/logging/backend.cpp b/src/common/logging/backend.cpp
index 0a081e7d47559d664d79faabfe70e5765f2fc14a..92e8e742d87df2991ec7446066f690e1d3ff2660 100644
--- a/src/common/logging/backend.cpp
+++ b/src/common/logging/backend.cpp
@@ -66,8 +66,9 @@ const char* GetLogClassName(Class log_class) {
         ALL_LOG_CLASSES()
 #undef CLS
 #undef SUB
+        case Class::Count:
+            UNREACHABLE();
     }
-    return "Unknown";
 }
 
 const char* GetLevelName(Level log_level) {