diff --git a/src/directory.cpp b/src/directory.cpp
index 4027b64..fd0f74b 100644
--- a/src/directory.cpp
+++ b/src/directory.cpp
@@ -10,6 +10,7 @@
 #include <utility>
 
 #ifdef _WIN32
+#define UNICODE
 #include <Windows.h>
 #else
 #include <cerrno>
@@ -37,7 +38,7 @@ create_directory(std::string_view label) {
   }
 
 #ifdef _WIN32
-  if (!CreateDirectoryW(path.c_str(), nullptr)) {
+  if (!CreateDirectory(path.c_str(), nullptr)) {
     ec = std::error_code(GetLastError(), std::system_category());
   }
 #else
@@ -52,9 +53,9 @@ create_directory(std::string_view label) {
 
 #ifdef _WIN32
   HANDLE handle =
-      CreateFileW(path.c_str(), GENERIC_READ | GENERIC_WRITE,
-                  FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
-                  nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
+      CreateFile(path.c_str(), GENERIC_READ | GENERIC_WRITE,
+                 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+                 nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
 #else
   int handle = open(path.data(), O_DIRECTORY);
 #endif
diff --git a/src/file.cpp b/src/file.cpp
index 6fcf2cd..4c8ee95 100644
--- a/src/file.cpp
+++ b/src/file.cpp
@@ -13,6 +13,7 @@
 #include <utility>
 
 #ifdef _WIN32
+#define UNICODE
 #include <Windows.h>
 #else
 #include <cerrno>
@@ -41,9 +42,9 @@ create_file(std::string_view label, std::string_view extension) {
 
 #ifdef _WIN32
   HANDLE handle =
-      CreateFileW(path.c_str(), GENERIC_READ | GENERIC_WRITE,
-                  FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
-                  nullptr, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, nullptr);
+      CreateFile(path.c_str(), GENERIC_READ | GENERIC_WRITE,
+                 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+                 nullptr, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, nullptr);
 
   if (handle == INVALID_HANDLE_VALUE) {
     ec = std::error_code(GetLastError(), std::system_category());