diff --git a/frontends/amiga/libs.c b/frontends/amiga/libs.c
index cbef3c2fa..7de768b6a 100644
--- a/frontends/amiga/libs.c
+++ b/frontends/amiga/libs.c
@@ -113,7 +113,9 @@
 
 #define AMINS_CLASS_CLOSE(PREFIX)	\
 	if(I##PREFIX) DropInterface((struct Interface *)I##PREFIX);	\
-	if(PREFIX##Base) CloseClass(PREFIX##Base);
+	if(PREFIX##Base) CloseClass(PREFIX##Base);	\
+	I##PREFIX = NULL;	\
+	PREFIX##Base = NULL;
 
 #define AMINS_CLASS_STRUCT(PREFIX)	\
 	struct ClassLibrary *PREFIX##Base = NULL;	\
@@ -136,7 +138,8 @@
 	}
 
 #define AMINS_LIB_CLOSE(PREFIX)	\
-	if(PREFIX##Base) CloseLibrary((struct Library *)PREFIX##Base);
+	if(PREFIX##Base) CloseLibrary((struct Library *)PREFIX##Base);	\
+	PREFIX##Base = NULL;
 
 #define AMINS_LIB_STRUCT(PREFIX)	\
 	struct PREFIX##Base *PREFIX##Base = NULL;
@@ -156,7 +159,8 @@
 	}
 
 #define AMINS_CLASS_CLOSE(PREFIX)	\
-	if(PREFIX##Base) CloseLibrary(PREFIX##Base);
+	if(PREFIX##Base) CloseLibrary(PREFIX##Base);	\
+	PREFIX##Base = NULL;
 
 #define AMINS_CLASS_STRUCT(PREFIX)	\
 	struct Library *PREFIX##Base = NULL;	\
diff --git a/frontends/amiga/schedule.c b/frontends/amiga/schedule.c
index 2d2da3899..ee4e34a10 100644
--- a/frontends/amiga/schedule.c
+++ b/frontends/amiga/schedule.c
@@ -170,7 +170,11 @@ static nserror schedule_remove(void (*callback)(void *p), void *p, bool abort)
 
 	if(nscb != NULL) {
 		if(abort == true) ami_schedule_remove_timer_event(nscb);
+#ifdef __amigaos4__
 		FreeSysObject(ASOT_IOREQUEST, nscb);
+#else
+		FreeVec(nscb);
+#endif
 		pblHeapConstruct(schedule_list);
 	}
 
@@ -190,7 +194,11 @@ static void schedule_remove_all(void)
 	{
 		ami_schedule_remove_timer_event(nscb);
 		pblIteratorRemove(iterator);
+#ifdef __amigaos4__
 		FreeSysObject(ASOT_IOREQUEST, nscb);
+#else
+		FreeVec(nscb);
+#endif
 	};
 
 	pblIteratorFree(iterator);
@@ -337,7 +345,7 @@ nserror ami_schedule(int t, void (*callback)(void *p), void *p)
 							TAG_DONE);
 #else
 	if(schedule_msgport == NULL) return NSERROR_NOMEM;
-	nscb = (struct nscallback *)CreateIORequest(schedule_msgport, sizeof(struct nscallback));
+	nscb = AllocVec(sizeof(struct nscallback), MEMF_PUBLIC | MEMF_CLEAR);
 	*nscb = *tioreq;
 #endif
 	if(!nscb) return NSERROR_NOMEM;