diff --git a/debian/changelog b/debian/changelog
index 73b00ef9c..3a37e0d48 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -11,6 +11,7 @@ linux (4.14~rc3-1~exp2) UNRELEASED; urgency=medium
   * net: Disable IRDA, which will soon be deleted upstream
   * [mips*] Increase RELOCATION_TABLE_SIZE to 0x00110000 for all flavours
     (fixes FTBFS)
+  * i40e: Build for 64-bit targets only (fixes FTBFS on hppa)
 
  -- Ben Hutchings <ben@decadent.org.uk>  Wed, 04 Oct 2017 01:44:24 +0100
 
diff --git a/debian/patches/bugfix/all/i40e-build-for-64-bit-targets-only.patch b/debian/patches/bugfix/all/i40e-build-for-64-bit-targets-only.patch
new file mode 100644
index 000000000..e976be47f
--- /dev/null
+++ b/debian/patches/bugfix/all/i40e-build-for-64-bit-targets-only.patch
@@ -0,0 +1,26 @@
+From: Ben Hutchings <ben@decadent.org.uk>
+Date: Wed, 4 Oct 2017 02:46:53 +0100
+Subject: i40e: Build for 64-bit targets only
+
+i40e now uses cmpxchg64(), which only works on a 64-bit (or non-SMP)
+system.  It seems reasonable to expect that 40G hardware is not used
+on 32-bit systems.
+
+Fixes: 841c950d67c6 ("i40e/i40evf: use cmpxchg64 when updating private ...")
+Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
+---
+ drivers/net/ethernet/intel/Kconfig | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/drivers/net/ethernet/intel/Kconfig b/drivers/net/ethernet/intel/Kconfig
+index 1feb54b6d92e..dd17bdf5561e 100644
+--- a/drivers/net/ethernet/intel/Kconfig
++++ b/drivers/net/ethernet/intel/Kconfig
+@@ -215,6 +215,7 @@ config I40E
+ 	tristate "Intel(R) Ethernet Controller XL710 Family support"
+ 	imply PTP_1588_CLOCK
+ 	depends on PCI
++	depends on 64BIT
+ 	---help---
+ 	  This driver supports Intel(R) Ethernet Controller XL710 Family of
+ 	  devices.  For more information on how to identify your adapter, go
diff --git a/debian/patches/series b/debian/patches/series
index 0bc579330..8938ee6df 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -76,6 +76,7 @@ bugfix/all/disable-some-marvell-phys.patch
 bugfix/all/fs-add-module_softdep-declarations-for-hard-coded-cr.patch
 bugfix/all/partially-revert-usb-kconfig-using-select-for-usb_co.patch
 bugfix/all/kbuild-include-addtree-remove-quotes-before-matching-path.patch
+bugfix/all/i40e-build-for-64-bit-targets-only.patch
 
 # Miscellaneous features