diff --git a/newlib/libc/sys/rtems/include/sys/mman.h b/newlib/libc/sys/rtems/include/sys/mman.h
index 53b656ceb..19d992e83 100644
--- a/newlib/libc/sys/rtems/include/sys/mman.h
+++ b/newlib/libc/sys/rtems/include/sys/mman.h
@@ -230,8 +230,6 @@ struct shmfd {
 #endif
 
 #ifdef _KERNEL
-int	shm_mmap(struct shmfd *shmfd, vm_size_t objsize, vm_ooffset_t foff,
-	    vm_object_t *obj);
 int	shm_map(struct file *fp, size_t size, off_t offset, void **memp);
 int	shm_unmap(struct file *fp, void *mem, size_t size);