diff --git a/kcalc-4.9.2-misc.patch b/kcalc-4.9.2-misc.patch
new file mode 100644
index 0000000..158177e
--- /dev/null
+++ b/kcalc-4.9.2-misc.patch
@@ -0,0 +1,42 @@
+diff -up kcalc-4.9.2/kcalc_core.cpp.me kcalc-4.9.2/kcalc_core.cpp
+--- kcalc-4.9.2/kcalc_core.cpp.me	2012-09-28 02:40:41.000000000 +0200
++++ kcalc-4.9.2/kcalc_core.cpp	2012-11-08 11:45:57.646032345 +0100
+@@ -104,7 +104,13 @@ static KNumber ExecDivide(const KNumber
+ 
+ static KNumber ExecMod(const KNumber &left_op, const KNumber &right_op)
+ {
+-    return left_op % right_op;
++    KNumber tmp_result = left_op % right_op;
++
++    if ( right_op < KNumber::Zero )
++       return -(-left_op % -right_op);
++    if ( tmp_result < KNumber::Zero )
++       tmp_result += right_op;
++    return tmp_result;
+ }
+ 
+ static KNumber ExecIntDiv(const KNumber &left_op, const KNumber &right_op)
+@@ -132,6 +138,9 @@ static KNumber ExecBinom(const KNumber &
+     KNumber tmp_count = left_op;
+     KNumber tmp_result = KNumber::One;
+ 
++    if ( right_op == KNumber::Zero )
++        return KNumber::One;
++
+     // don't do recursive factorial,
+     // because large numbers lead to
+     // stack overflows
+@@ -587,8 +596,11 @@ void CalcEngine::Exp10(const KNumber &in
+ 
+ void CalcEngine::Factorial(const KNumber &input)
+ {
+-    if (input == KNumber::PosInfinity) return;
+-    if (input < KNumber::Zero || input.type() == KNumber::SpecialType) {
++    if (input == KNumber::PosInfinity || input > KNumber(999999)) {
++       last_number_ = KNumber::PosInfinity;
++       return;
++    }
++    if (input < KNumber::Zero || input.type() == KNumber::SpecialType || input.type() != KNumber::IntegerType) {
+         error_ = true;
+         last_number_ = KNumber::NotDefined;
+         return;
diff --git a/kcalc.spec b/kcalc.spec
index 8d49457..5f03ac1 100644
--- a/kcalc.spec
+++ b/kcalc.spec
@@ -1,7 +1,7 @@
 Name: kcalc 
 Summary: Scientific Calculator 
 Version: 4.9.3
-Release: 1%{?dist}
+Release: 2%{?dist}
 
 License: GPLv2+
 URL:     https://projects.kde.org/projects/kde/kdeutils/kcalc
@@ -13,6 +13,9 @@ URL:     https://projects.kde.org/projects/kde/kdeutils/kcalc
 %endif
 Source0: http://download.kde.org/%{stable}/%{version}/src/%{name}-%{version}.tar.xz
 
+# fix arithmetic fault in binomial, factorial
+Patch0: kcalc-4.9.2-misc.patch
+
 BuildRequires: desktop-file-utils
 BuildRequires: kdelibs4-devel >= %{version}
 BuildRequires: gmp-devel
@@ -34,6 +37,7 @@ functions than meet the eye on a first glance.
 %prep
 %setup -q -n %{name}-%{version}
 
+%patch0 -p1 -b .misc
 
 %build
 mkdir -p %{_target_platform}
@@ -66,6 +70,9 @@ desktop-file-validate %{buildroot}%{_kde4_datadir}/applications/kde4/%{name}.des
 
 
 %changelog
+* Thu Nov 08 2012 Than Ngo <than@redhat.com> - 4.9.3-2
+- fix arithmetic fault in binomial, factorial
+
 * Sat Nov 03 2012 Rex Dieter <rdieter@fedoraproject.org> - 4.9.3-1
 - 4.9.3