diff --git a/acinclude.m4 b/acinclude.m4
index 6cfb1e53ef7..f2a1ea6ad95 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -375,7 +375,6 @@ AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_defrag.*net],
                   [OVS_DEFINE([HAVE_IP_DEFRAG_TAKES_NET])])
   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_do_fragment])
-  OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_is_fragment])
   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_skb_dst_mtu])
 
   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [IPSKB_FRAG_PMTU],
diff --git a/datapath/linux/compat/include/net/ip.h b/datapath/linux/compat/include/net/ip.h
index 145529ecbbe..c283ad0a76d 100644
--- a/datapath/linux/compat/include/net/ip.h
+++ b/datapath/linux/compat/include/net/ip.h
@@ -6,13 +6,6 @@
 #include <net/route.h>
 #include <linux/version.h>
 
-#ifndef HAVE_IP_IS_FRAGMENT
-static inline bool ip_is_fragment(const struct iphdr *iph)
-{
-	return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
-}
-#endif
-
 #ifndef HAVE_INET_GET_LOCAL_PORT_RANGE_USING_NET
 static inline void rpl_inet_get_local_port_range(struct net *net, int *low,
 					     int *high)
diff --git a/datapath/linux/compat/include/net/netfilter/ipv6/nf_defrag_ipv6.h b/datapath/linux/compat/include/net/netfilter/ipv6/nf_defrag_ipv6.h
index 09fe78101f3..c65e7f2feb0 100644
--- a/datapath/linux/compat/include/net/netfilter/ipv6/nf_defrag_ipv6.h
+++ b/datapath/linux/compat/include/net/netfilter/ipv6/nf_defrag_ipv6.h
@@ -2,10 +2,7 @@
 #define _NF_DEFRAG_IPV6_WRAPPER_H
 
 #include <linux/kconfig.h>
-
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37)
 #include_next <net/netfilter/ipv6/nf_defrag_ipv6.h>
-#endif
 
 /* Upstream commit 029f7f3b8701 ("netfilter: ipv6: nf_defrag: avoid/free clone
  * operations") changed the semantics of nf_ct_frag6_gather(), so we backport