diff --git a/include/font/fontconfig.h b/include/font/fontconfig.h
index 0e690b2099..1536fa166f 100644
--- a/include/font/fontconfig.h
+++ b/include/font/fontconfig.h
@@ -25,6 +25,7 @@
 
 #include <wx/string.h>
 #include <vector>
+#include <unordered_map>
 #include <map>
 #include <font/fontinfo.h>