diff --git a/tests/utils.h b/tests/utils.h
index 00cef628..5f2f9814 100644
--- a/tests/utils.h
+++ b/tests/utils.h
@@ -29,8 +29,8 @@ inline string copyFile(const string &filename, const string &ext)
   string newname = string(tempnam(NULL, NULL)) + ext;
   string oldname = testFilePath(filename) + ext;
 #ifdef _WIN32
-  CopyFile(oldname.c_str(), newname.c_str(), FALSE);
-  SetFileAttributes(newname.c_str(), GetFileAttributes(newname.c_str()) & ~FILE_ATTRIBUTE_READONLY);
+  CopyFileA(oldname.c_str(), newname.c_str(), FALSE);
+  SetFileAttributesA(newname.c_str(), GetFileAttributesA(newname.c_str()) & ~FILE_ATTRIBUTE_READONLY);
 #else
   char buffer[4096];
   int bytes;