diff --git a/sgmltool-flex.patch b/sgmltool-flex.patch
new file mode 100644
index 0000000..13ff2e8
--- /dev/null
+++ b/sgmltool-flex.patch
@@ -0,0 +1,13 @@
+Index: sgml-tools-1.0.9/rtf-fix/rtf2rtf.l
+===================================================================
+--- sgml-tools-1.0.9.orig/rtf-fix/rtf2rtf.l
++++ sgml-tools-1.0.9/rtf-fix/rtf2rtf.l
+@@ -72,7 +72,7 @@ int current;
+ int skipnewline = 0;
+ 
+ extern char *yytext;
+-extern int yyleng;
++extern size_t yyleng;
+ 
+ #define CHAPTER 1
+ #define SECTION 2
diff --git a/sgmltool.changes b/sgmltool.changes
index 0f56008..220cc8b 100644
--- a/sgmltool.changes
+++ b/sgmltool.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Mon Nov 19 09:06:57 UTC 2012 - idonmez@suse.com
+
+- Add sgmltool-flex.patch: yyleng must be size_t with new flex
+
 -------------------------------------------------------------------
 Thu Aug  2 12:42:50 UTC 2012 - jengelh@inai.de
 
diff --git a/sgmltool.spec b/sgmltool.spec
index 466f8e6..7fdc76a 100644
--- a/sgmltool.spec
+++ b/sgmltool.spec
@@ -54,6 +54,7 @@ Patch6:         cflags-sgml-tools-1.0.9.diff
 Patch7:         sgml-tools-1.0.9-sgmlpre.diff
 Patch8:         sgml-tools-1.0.9-strip.diff
 Patch9:         sgml-tools-1.0.9-latex.diff
+Patch10:        sgmltool-flex.patch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 
 %description
@@ -90,6 +91,7 @@ an example).
 %patch8
 %if 0%{suse_version} > 1220
 %patch9
+%patch10 -p1
 %endif
 
 %build