diff --git a/backends/frotz/dfrotz/common/main.c b/backends/frotz/dfrotz/common/main.c
index f9486b0a9522ca96033737e9c03bf2625687619d..3f5964b3e5daed98ebd88c73e8e4791473f0b5cf 100644
--- a/backends/frotz/dfrotz/common/main.c
+++ b/backends/frotz/dfrotz/common/main.c
@@ -32,9 +32,12 @@
 #define cdecl
 #endif
 
-extern void interpret (void);
 extern void init_memory (void);
 extern void init_undo (void);
+extern void init_sound (void);
+extern void init_buffer (void);
+extern void init_process (void);
+extern void interpret (void);
 extern void reset_memory (void);
 
 /* Story file name, id number and size */