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
@@ -807,6 +807,12 @@
     const int64_t random_int64 =
         fuzzed_data_provider.ConsumeIntegral<int64_t>();
     const std::string tostring_without_locale = ToString(random_int64);
+    // The variable `random_int32` is no longer used, but the harness still
+    // needs to consume the same data that it did previously to not invalidate
+    // existing seeds.
+    const int32_t random_int32 =
+        fuzzed_data_provider.ConsumeIntegral<int32_t>();
+    (void)random_int32;
     const std::string strprintf_int_without_locale =
         strprintf("%d", random_int64);
     const double random_double =