diff --git a/test/fuzz/provider.h b/test/fuzz/provider.h
index 6dd08219..47b23f5e 100644
--- a/test/fuzz/provider.h
+++ b/test/fuzz/provider.h
@@ -66,25 +66,6 @@ class provider {
         return static_cast<T>(static_cast<uint64_t>(min) + result);
     }
 
-    template <typename TS, typename TU>
-    [[nodiscard]] static auto convert_unsigned_to_signed(TU value) -> TS {
-        static_assert(sizeof(TS) == sizeof(TU), "Incompatible data types.");
-        static_assert(!std::numeric_limits<TU>::is_signed, "Source type must be unsigned.");
-
-        if constexpr (std::numeric_limits<TS>::is_modulo) {
-            return static_cast<TS>(value);
-        } else {
-
-            // Avoid using implementation-defined unsigned to signed conversions.
-            // To learn more, see https://stackoverflow.com/questions/13150449.
-            if (value <= std::numeric_limits<TS>::max()) {
-                return static_cast<TS>(value);
-            }
-            constexpr auto ts_min = std::numeric_limits<TS>::min();
-            return static_cast<TS>(ts_min + static_cast<TS>(value - ts_min));
-        }
-    }
-
     inline void advance_unchecked(size_t num_bytes) {
         m_data += num_bytes;
         m_remaining_bytes -= num_bytes;
diff --git a/test/fuzz/run.cpp b/test/fuzz/run.cpp
index ff742a37..b5668452 100644
--- a/test/fuzz/run.cpp
+++ b/test/fuzz/run.cpp
@@ -90,7 +90,6 @@ auto env(char const* varname) -> std::optional<std::string> {
             }
             // could not read file
             throw std::runtime_error(fmt::format("could not read '{}'", filename.string()));
-            return {};
         }
         if (p == p.root_path()) {
             return {};
diff --git a/test/unit/fuzz_replace_map.cpp b/test/unit/fuzz_replace_map.cpp
index f213722a..242a5705 100644
--- a/test/unit/fuzz_replace_map.cpp
+++ b/test/unit/fuzz_replace_map.cpp
@@ -1,8 +1,8 @@
 #include <ankerl/unordered_dense.h>
-
+#include <app/doctest.h>
 #include <fuzz/run.h>
 
-#include <app/doctest.h>
+#include <unordered_map>
 
 namespace {