diff --git a/src/fs.h b/src/fs.h
--- a/src/fs.h
+++ b/src/fs.h
@@ -246,7 +246,9 @@
 typedef fs::ifstream ifstream;
 typedef fs::ofstream ofstream;
 #endif // WIN32 && __GLIBCXX__
-};     // namespace fsbridge
+
+fs::path GetTempDirectoryPath();
+}; // namespace fsbridge
 
 // Disallow path operator<< formatting in tinyformat to avoid locale-dependent
 // encoding on windows.
diff --git a/src/fs.cpp b/src/fs.cpp
--- a/src/fs.cpp
+++ b/src/fs.cpp
@@ -265,4 +265,17 @@
 #endif // __GLIBCXX__
 #endif // WIN32
 
+fs::path GetTempDirectoryPath() {
+#ifndef WIN32
+    return fs::temp_directory_path();
+#else
+    wchar_t dirPathWchars[MAX_PATH];
+    GetTempPathW(MAX_PATH, dirPathWchars);
+    std::wstring dirPathWstring(dirPathWchars);
+    return fs::PathFromString(
+        std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>>().to_bytes(
+            dirPathWstring));
+#endif
+}
+
 } // namespace fsbridge
diff --git a/src/test/util/setup_common.cpp b/src/test/util/setup_common.cpp
--- a/src/test/util/setup_common.cpp
+++ b/src/test/util/setup_common.cpp
@@ -103,7 +103,8 @@
 
 BasicTestingSetup::BasicTestingSetup(
     const std::string &chainName, const std::vector<const char *> &extra_args)
-    : m_path_root{fs::temp_directory_path() / "test_common_" PACKAGE_NAME /
+    : m_path_root{fsbridge::GetTempDirectoryPath() /
+                  "test_common_" PACKAGE_NAME /
                   g_insecure_rand_ctx_temp_path.rand256().ToString()},
       m_args{} {
     // clang-format off