diff --git a/contrib/teamcity/build-configurations.yml b/contrib/teamcity/build-configurations.yml
--- a/contrib/teamcity/build-configurations.yml
+++ b/contrib/teamcity/build-configurations.yml
@@ -161,6 +161,7 @@
 
   build-fuzzer:
     clang: true
+    Werror: true
     cmake_flags:
       - '-DENABLE_SANITIZERS=fuzzer'
     targets:
diff --git a/src/test/fuzz/locale.cpp b/src/test/fuzz/locale.cpp
--- a/src/test/fuzz/locale.cpp
+++ b/src/test/fuzz/locale.cpp
@@ -807,8 +807,6 @@
     const int64_t random_int64 =
         fuzzed_data_provider.ConsumeIntegral<int64_t>();
     const std::string tostring_without_locale = ToString(random_int64);
-    const int32_t random_int32 =
-        fuzzed_data_provider.ConsumeIntegral<int32_t>();
     const std::string strprintf_int_without_locale =
         strprintf("%d", random_int64);
     const double random_double =