diff --git a/grub2-fix-build-with-flex-2.6.4.patch b/grub2-fix-build-with-flex-2.6.4.patch
new file mode 100644
index 0000000..d7c2d55
--- /dev/null
+++ b/grub2-fix-build-with-flex-2.6.4.patch
@@ -0,0 +1,24 @@
+From: Andrei Borzenkov <arvidjaar@gmail.com>
+
+Fix build with flex 2.6.4+. It no more casts fprintf() call to void, resulting in
+
+[  108s] grub_script.yy.c: In function 'yy_fatal_error':
+[  108s] grub_script.yy.c:18:22: error: statement with no effect [-Werror=unused-value]
+[  108s]  
+
+as grub2 defines fprintf as 0. Change it to explicitly define fprintf as (void)0.
+
+flex commit: https://github.com/westes/flex/commit/a58086a269d3d7367530c1a178644a8e5f1a374f
+Index: grub-2.02/grub-core/script/yylex.l
+===================================================================
+--- grub-2.02.orig/grub-core/script/yylex.l
++++ grub-2.02/grub-core/script/yylex.l
+@@ -91,7 +91,7 @@ typedef size_t yy_size_t;
+ #define stdin  0
+ #define stdout 0
+ 
+-#define fprintf(...) 0
++#define fprintf(...) (void)0
+ #define exit(...) grub_fatal("fatal error in lexer")
+ #endif
+ 
diff --git a/grub2.changes b/grub2.changes
index 1d2cfae..ec67cd8 100644
--- a/grub2.changes
+++ b/grub2.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Tue Jul  4 16:56:33 UTC 2017 - arvidjaar@gmail.com
+
+- add grub2-fix-build-with-flex-2.6.4.patch - fix build with flex 2.6.4+
+  that removed explicit (void) cast from fprintf call in yy_fatal_error.
+
 -------------------------------------------------------------------
 Thu Jun  1 09:45:44 UTC 2017 - mchang@suse.com
 
diff --git a/grub2.spec b/grub2.spec
index 3b56112..cd6de16 100644
--- a/grub2.spec
+++ b/grub2.spec
@@ -169,6 +169,7 @@ Patch6:         grub2-iterate-and-hook-for-extended-partition.patch
 Patch8:         grub2-ppc-terminfo.patch
 Patch9:         grub2-GRUB_CMDLINE_LINUX_RECOVERY-for-recovery-mode.patch
 Patch10:        grub2-fix-error-terminal-gfxterm-isn-t-found.patch
+Patch11:        grub2-fix-build-with-flex-2.6.4.patch
 Patch12:        grub2-fix-menu-in-xen-host-server.patch
 Patch15:        not-display-menu-when-boot-once.patch
 Patch17:        grub2-pass-corret-root-for-nfsroot.patch
@@ -435,6 +436,7 @@ swap partition while in resuming
 %patch8 -p1
 %patch9 -p1
 %patch10 -p1
+%patch11 -p1
 %patch12 -p1
 %patch15 -p1
 %patch17 -p1