diff --git a/stand/powerpc/kboot/host_syscall.h b/stand/powerpc/kboot/host_syscall.h
index 0d47bd58a44a..349c54e586a6 100644
--- a/stand/powerpc/kboot/host_syscall.h
+++ b/stand/powerpc/kboot/host_syscall.h
@@ -33,7 +33,7 @@
 ssize_t host_read(int fd, void *buf, size_t nbyte);
 ssize_t host_write(int fd, const void *buf, size_t nbyte);
 ssize_t host_seek(int fd, int64_t offset, int whence);
-int host_open(char *path, int flags, int mode);
+int host_open(const char *path, int flags, int mode);
 int host_close(int fd);
 void *host_mmap(void *addr, size_t len, int prot, int flags, int fd, int);
 #define host_getmem(size) host_mmap(0, size, 3 /* RW */, 0x22 /* ANON */, -1, 0);
diff --git a/stand/powerpc/kboot/kbootfdt.c b/stand/powerpc/kboot/kbootfdt.c
index 5ab3c3da43c9..67a2082eddd9 100644
--- a/stand/powerpc/kboot/kbootfdt.c
+++ b/stand/powerpc/kboot/kbootfdt.c
@@ -119,7 +119,7 @@ fdt_linux_fixups(void *fdtp)
 
 	offset = fdt_path_offset(fdtp, "/ibm,opal");
 	if (offset > 0) {
-		uint64_t *base, *size;
+		const uint64_t *base, *size;
 		base = fdt_getprop(fdtp, offset, "opal-base-address",
 		    &len);
 		size = fdt_getprop(fdtp, offset, "opal-runtime-size",
@@ -130,7 +130,7 @@ fdt_linux_fixups(void *fdtp)
 	}
 	offset = fdt_path_offset(fdtp, "/rtas");
 	if (offset > 0) {
-		uint32_t *base, *size;
+		const uint32_t *base, *size;
 		base = fdt_getprop(fdtp, offset, "linux,rtas-base", &len);
 		size = fdt_getprop(fdtp, offset, "rtas-size", &len);
 		if (base != NULL && size != NULL)