diff --git a/0006-fix-compilation-error-by-adding-stdint.h.patch b/0006-fix-compilation-error-by-adding-stdint.h.patch
new file mode 100644
index 0000000..3f33240
--- /dev/null
+++ b/0006-fix-compilation-error-by-adding-stdint.h.patch
@@ -0,0 +1,33 @@
+From 831a9ea232f128c13c36066a704f6ccafa335244 Mon Sep 17 00:00:00 2001
+From: Nirmoy Das <ndas@suse.de>
+Date: Tue, 5 Sep 2017 11:17:16 +0200
+Subject: [PATCH] fix compilation error by adding stdint.h
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+error:
+utils/utils/memory.h:99:15: error: ‘uintptr_t’ undeclared (first use in this function); did you mean ‘__intptr_t’?
+  for (i = 0; (uintptr_t)&c[i] % sizeof(long) && i < n; i++)
+               ^~~~~~~~~
+               __intptr_t
+---
+ src/libstrongswan/utils/utils/memory.h | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/src/libstrongswan/utils/utils/memory.h b/src/libstrongswan/utils/utils/memory.h
+index b978e7c..55aaaf5 100644
+--- a/src/libstrongswan/utils/utils/memory.h
++++ b/src/libstrongswan/utils/utils/memory.h
+@@ -22,6 +22,8 @@
+ #ifndef MEMORY_H_
+ #define MEMORY_H_
+ 
++#include <stdint.h>
++
+ /**
+  * Helper function that compares two binary blobs for equality
+  */
+-- 
+2.14.1
+
diff --git a/strongswan.changes b/strongswan.changes
index 8634b62..ee86ec6 100644
--- a/strongswan.changes
+++ b/strongswan.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Tue Sep  5 11:33:01 CEST 2017 - ndas@suse.de
+
+- fix "uintptr_t’ undeclared" compilation error.
+  [+0006-fix-compilation-error-by-adding-stdint.h.patch]
+
 -------------------------------------------------------------------
 Mon Jul 31 18:30:28 CEST 2017 - ndas@suse.de
 
diff --git a/strongswan.spec b/strongswan.spec
index cbe3898..42da88c 100644
--- a/strongswan.spec
+++ b/strongswan.spec
@@ -83,6 +83,7 @@ Patch3:         %{name}_fipscheck.patch
 Patch4:         %{name}_fipsfilter.patch
 %endif
 Patch5:         0005-ikev1-Don-t-retransmit-Aggressive-Mode-response.patch
+Patch6:         0006-fix-compilation-error-by-adding-stdint.h.patch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 BuildRequires:  bison
 BuildRequires:  curl-devel
@@ -294,6 +295,7 @@ and the load testing plugin for IKEv2 daemon.
 %patch4 -p1
 %endif
 %patch5 -p1
+%patch6 -p1
 sed -e 's|@libexecdir@|%_libexecdir|g'    \
      < $RPM_SOURCE_DIR/strongswan.init.in \
      > strongswan.init