diff --git a/runtime-light/k2-platform/k2-api.h b/runtime-light/k2-platform/k2-api.h
index 1bbf21333b..9eb8f2b445 100644
--- a/runtime-light/k2-platform/k2-api.h
+++ b/runtime-light/k2-platform/k2-api.h
@@ -36,6 +36,7 @@ inline constexpr size_t DEFAULT_MEMORY_ALIGN = 16;
 } // namespace k2_impl_
 
 inline constexpr int32_t errno_ok = 0;
+inline constexpr int32_t errno_e2big = E2BIG;
 inline constexpr int32_t errno_ebusy = EBUSY;
 inline constexpr int32_t errno_enodev = ENODEV;
 inline constexpr int32_t errno_einval = EINVAL;
diff --git a/runtime-light/stdlib/system/system-functions.cpp b/runtime-light/stdlib/system/system-functions.cpp
index 3b848c5389..428d3e9fe4 100644
--- a/runtime-light/stdlib/system/system-functions.cpp
+++ b/runtime-light/stdlib/system/system-functions.cpp
@@ -28,8 +28,9 @@ Optional<string> f$iconv(const string& input_encoding, const string& output_enco
     char* input_buf{const_cast<char*>(input_str.c_str())};
     char* output_buf{output_str.buffer()};
     size_t res{};
-    if (k2::iconv(std::addressof(res), cd, std::addressof(input_buf), std::addressof(input_len), std::addressof(output_buf), std::addressof(output_len)) ==
-        k2::errno_ok) {
+    if (auto iconv_result{
+            k2::iconv(std::addressof(res), cd, std::addressof(input_buf), std::addressof(input_len), std::addressof(output_buf), std::addressof(output_len))};
+        iconv_result != k2::errno_e2big) {
       output_str.shrink(static_cast<string::size_type>(output_buf - output_str.c_str()));
       return output_str;
     }
diff --git a/tests/phpt/dl/475_convert_to_win.php b/tests/phpt/dl/475_convert_to_win.php
index ac182bfa28..3437bbcb48 100644
--- a/tests/phpt/dl/475_convert_to_win.php
+++ b/tests/phpt/dl/475_convert_to_win.php
@@ -1,4 +1,4 @@
-@ok benchmark k2_skip
+@ok benchmark
 <?php
 $str = "мама мыла раму!!! asfmklasdfasdgbsfbvdf buydfbdvbdfb vdfv dfv";