diff --git a/doc/pet.sgml b/doc/pet.sgml
index eb13d9fb9..6bedf6a0f 100644
--- a/doc/pet.sgml
+++ b/doc/pet.sgml
@@ -105,6 +105,7 @@ declaration and usage.
 <item>cbm_save
 <item>cbm_write
 <item>get_tv
+<item>waitvsync
 </itemize>
 
 
diff --git a/include/cbm.h b/include/cbm.h
index ac3615c38..5bcef8e60 100644
--- a/include/cbm.h
+++ b/include/cbm.h
@@ -166,7 +166,7 @@ unsigned char get_tv (void);
 unsigned char __fastcall__ kbrepeat (unsigned char mode);
 /* Changes which keys have automatic repeat. */
 
-#if !defined(__CBM610__) && !defined(__PET__)
+#if !defined(__CBM610__)
 void waitvsync (void);
 /* Wait for the start of the next video field. */
 #endif