diff --git a/sys/arm/include/machdep.h b/sys/arm/include/machdep.h
index f50cde887c4a..c48b0a3a5573 100644
--- a/sys/arm/include/machdep.h
+++ b/sys/arm/include/machdep.h
@@ -5,6 +5,7 @@
 #define _MACHDEP_BOOT_MACHDEP_H_
 
 /* Structs that need to be initialised by initarm */
+struct pv_addr;
 extern struct pv_addr irqstack;
 extern struct pv_addr undstack;
 extern struct pv_addr abtstack;
@@ -15,13 +16,14 @@ extern struct pv_addr abtstack;
 #define UND_STACK_SIZE	1
 
 /* misc prototypes used by the many arm machdeps */
+struct trapframe;
 void arm_lock_cache_line(vm_offset_t);
 void init_proc0(vm_offset_t kstack);
 void halt(void);
-void data_abort_handler(trapframe_t *);
-void prefetch_abort_handler(trapframe_t *);
+void data_abort_handler(struct trapframe *);
+void prefetch_abort_handler(struct trapframe *);
 void set_stackptrs(int cpu);
-void undefinedinstruction_bounce(trapframe_t *);
+void undefinedinstruction_bounce(struct trapframe *);
 
 /* Early boot related helper functions */
 struct arm_boot_params;