diff --git a/check_cpu.sh/check_cpu.sh b/check_cpu.sh/check_cpu.sh
index 38b6a09..d983572 100755
--- a/check_cpu.sh/check_cpu.sh
+++ b/check_cpu.sh/check_cpu.sh
@@ -167,6 +167,11 @@ must be lower than the critical level!"
         exit $ST_UK
     fi
 fi
+which bc >> /dev/null
+if [ $? -gt 0 ]; then
+	echo "UNKNOWN - command 'bc' not found in path. Exiting..."
+	exit 3
+fi
 
 get_cpuvals
 do_output
diff --git a/check_cpu.sh/nagios-plugins-check_cpu.spec b/check_cpu.sh/nagios-plugins-check_cpu.spec
index c4d48d6..bba18d8 100644
--- a/check_cpu.sh/nagios-plugins-check_cpu.spec
+++ b/check_cpu.sh/nagios-plugins-check_cpu.spec
@@ -8,7 +8,7 @@ License:	GPLv2+
 Group:		Applications/System
 URL:		http://www.matejunkie.com/cpu-check-plugin-for-nagios/
 Source0:	http://opensource.ok.is/trac/browser/nagios-plugins/check_cpu/releases/nagios-plugins-check_cpu-%{version}.tar.gz
-Requires:	nrpe
+Requires:	nrpe bc
 BuildRoot:	%{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 Packager:	Tomas Edwardsson <tommi@ok.is>
 BuildArch:	noarch