diff --git a/Source/restrict.cpp b/Source/restrict.cpp
index 79f4f3eb4..c210157ea 100644
--- a/Source/restrict.cpp
+++ b/Source/restrict.cpp
@@ -17,7 +17,7 @@ namespace devilution {
 void ReadOnlyTest()
 {
 	const std::string path = paths::PrefPath() + "Diablo1ReadOnlyTest.foo";
-	FILE *f = fopen(path.c_str(), "wt");
+	FILE *f = FOpen(path.c_str(), "wt");
 	if (f == nullptr) {
 		DirErrorDlg(paths::PrefPath().c_str());
 	}