diff --git a/src/osd/modules/file/windir.cpp b/src/osd/modules/file/windir.cpp
index e03b13782fd..34606dcba6f 100644
--- a/src/osd/modules/file/windir.cpp
+++ b/src/osd/modules/file/windir.cpp
@@ -108,7 +108,7 @@ bool win_directory::open_impl(std::string const &dirname)
 	assert(m_find == INVALID_HANDLE_VALUE);
 
 	// append \*.* to the directory name
-	std::string dirfilter = string_format("%s\\*.*", dirname);
+	std::string dirfilter = util::string_format("%s\\*.*", dirname);
 
 	// convert the path to TCHARs
 	osd::text::tstring t_dirfilter = osd::text::to_tstring(dirfilter);
diff --git a/src/osd/modules/file/winrtdir.cpp b/src/osd/modules/file/winrtdir.cpp
index f1ade923e81..19c328ea094 100644
--- a/src/osd/modules/file/winrtdir.cpp
+++ b/src/osd/modules/file/winrtdir.cpp
@@ -108,7 +108,7 @@ bool win_directory::open_impl(std::string const &dirname)
 	assert(m_find == INVALID_HANDLE_VALUE);
 
 	// append \*.* to the directory name
-	std::string dirfilter = string_format("%s\\*.*", dirname);
+	std::string dirfilter = util::string_format("%s\\*.*", dirname);
 
 	// convert the path to TCHARs
 	osd::text::tstring t_dirfilter = osd::text::to_tstring(dirfilter);