diff --git a/modules/core/util/func_tests/util_tests.cpp b/modules/core/util/func_tests/util_tests.cpp
index 2b7ca797..35901076 100644
--- a/modules/core/util/func_tests/util_tests.cpp
+++ b/modules/core/util/func_tests/util_tests.cpp
@@ -6,8 +6,15 @@
 
 #include "core/util/include/util.hpp"
 
+#ifdef _WIN32
+#include <Windows.h>
+inline int unsetenv(const char* name) { return SetEnvironmentVariableA(name, NULL) ? 0 : -1; }
+inline int setenv(const char* name, const char* value, int /*overwrite*/) {
+  return SetEnvironmentVariableA(name, value) ? 0 : -1;
+}
+#endif
+
 TEST(util_tests, check_unset_env) {
-#ifndef _WIN32
   int save_var = ppc::util::GetPPCNumThreads();
 
   unsetenv("PPC_NUM_THREADS");  // NOLINT(concurrency-mt-unsafe)
@@ -15,13 +22,9 @@ TEST(util_tests, check_unset_env) {
   EXPECT_EQ(ppc::util::GetPPCNumThreads(), 1);
 
   setenv("PPC_NUM_THREADS", std::to_string(save_var).c_str(), 1);  // NOLINT(concurrency-mt-unsafe)
-#else
-  GTEST_SKIP();
-#endif
 }
 
 TEST(util_tests, check_set_env) {
-#ifndef _WIN32
   int save_var = ppc::util::GetPPCNumThreads();
 
   const int num_threads = static_cast<int>(std::thread::hardware_concurrency());
@@ -30,7 +33,4 @@ TEST(util_tests, check_set_env) {
   EXPECT_EQ(ppc::util::GetPPCNumThreads(), num_threads);
 
   setenv("PPC_NUM_THREADS", std::to_string(save_var).c_str(), 1);  // NOLINT(concurrency-mt-unsafe)
-#else
-  GTEST_SKIP();
-#endif
 }
diff --git a/modules/core/util/src/util.cpp b/modules/core/util/src/util.cpp
index a1516e8d..64d8854b 100644
--- a/modules/core/util/src/util.cpp
+++ b/modules/core/util/src/util.cpp
@@ -1,13 +1,7 @@
+#define _CRT_SECURE_NO_WARNINGS
 #include "core/util/include/util.hpp"
 
 #include <cstdlib>
-#ifdef _WIN32
-#include <cstdint>
-#include <iostream>
-#include <memory>
-#include <vector>
-#endif
-
 #include <filesystem>
 #include <string>
 
@@ -17,17 +11,13 @@ std::string ppc::util::GetAbsolutePath(const std::string &relative_path) {
 }
 
 int ppc::util::GetPPCNumThreads() {
-#ifdef _WIN32
-  size_t len;
-  char omp_env[100];
-  errno_t err = getenv_s(&len, omp_env, sizeof(omp_env), "PPC_NUM_THREADS");
-  if (err != 0 || len == 0) {
-    omp_env[0] = '\0';
+  const char *env = std::getenv("PPC_NUM_THREADS");  // NOLINT(concurrency-mt-unsafe)
+  if ((env != nullptr) && (*env != 0)) {
+    char *endptr = nullptr;
+    long val = std::strtol(env, &endptr, 10);
+    if (endptr != env && val > 0) {
+      return static_cast<int>(val);
+    }
   }
-  int num_threads = std::atoi(omp_env);
-#else
-  const char *omp_env = std::getenv("PPC_NUM_THREADS");  // NOLINT(concurrency-mt-unsafe)
-  int num_threads = (omp_env != nullptr) ? std::atoi(omp_env) : 1;
-#endif
-  return num_threads;
+  return 1;
 }