diff --git a/drivers/iommu/io-pgtable.h b/drivers/iommu/io-pgtable.h
index 48538a3..ac9e234 100644
--- a/drivers/iommu/io-pgtable.h
+++ b/drivers/iommu/io-pgtable.h
@@ -143,4 +143,9 @@
 	void (*free)(struct io_pgtable *iop);
 };
 
+extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns;
+extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns;
+extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns;
+extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns;
+
 #endif /* __IO_PGTABLE_H */