diff --git a/arch/parisc/kernel/pdt.c b/arch/parisc/kernel/pdt.c
index b651d020e0e5..0d24735bd918 100644
--- a/arch/parisc/kernel/pdt.c
+++ b/arch/parisc/kernel/pdt.c
@@ -16,6 +16,7 @@
 #include <linux/memblock.h>
 #include <linux/seq_file.h>
 #include <linux/kthread.h>
+#include <linux/proc_fs.h>
 #include <linux/initrd.h>
 #include <linux/pgtable.h>
 #include <linux/mm.h>