diff --git a/src/filesystem.h b/src/filesystem.h
index b2230c8..08d573f 100644
--- a/src/filesystem.h
+++ b/src/filesystem.h
@@ -25,7 +25,7 @@
 #include <SDL_rwops.h>
 
 struct FileSystemPrivate;
-struct SharedFontState;
+class SharedFontState;
 
 class FileSystem
 {