diff --git a/src/test/fuzz/util.h b/src/test/fuzz/util.h
index 30a3580e3913cf..b2bf75b3790ddd 100644
--- a/src/test/fuzz/util.h
+++ b/src/test/fuzz/util.h
@@ -398,7 +398,7 @@ class FuzzedFileProvider
             return 0;
         }
         std::memcpy(buf, random_bytes.data(), random_bytes.size());
-        if (AdditionOverflow(static_cast<size_t>(fuzzed_file->m_offset), random_bytes.size())) {
+        if (AdditionOverflow(fuzzed_file->m_offset, static_cast<size_t>(random_bytes.size()))) {
             return fuzzed_file->m_fuzzed_data_provider.ConsumeBool() ? 0 : -1;
         }
         fuzzed_file->m_offset += random_bytes.size();
@@ -410,7 +410,7 @@ class FuzzedFileProvider
         FuzzedFileProvider* fuzzed_file = (FuzzedFileProvider*)cookie;
         SetFuzzedErrNo(fuzzed_file->m_fuzzed_data_provider);
         const ssize_t n = fuzzed_file->m_fuzzed_data_provider.ConsumeIntegralInRange<ssize_t>(0, size);
-        if (AdditionOverflow(static_cast<ssize_t>(fuzzed_file->m_offset), n)) {
+        if (AdditionOverflow(fuzzed_file->m_offset, static_cast<size_t>(n))) {
             return fuzzed_file->m_fuzzed_data_provider.ConsumeBool() ? 0 : -1;
         }
         fuzzed_file->m_offset += n;