diff --git a/acinclude.m4 b/acinclude.m4
index 96389b274b..705b9458b5 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -8,6 +8,7 @@ m4_include([build/config/ax_lib_mysql.m4])
 m4_include([build/config/ax_check_java.m4])
 m4_include([build/config/erlang.m4])
 m4_include([build/config/odbc.m4])
+m4_include([build/config/sched_setaffinity.m4])
 m4_include([libs/apr/build/apr_common.m4])
 m4_include([libs/sofia-sip/m4/sac-pkg-config.m4])
 m4_include([libs/sofia-sip/m4/sac-openssl.m4])
diff --git a/build/config/sched_setaffinity.m4 b/build/config/sched_setaffinity.m4
new file mode 100644
index 0000000000..d458dbb069
--- /dev/null
+++ b/build/config/sched_setaffinity.m4
@@ -0,0 +1,16 @@
+AC_DEFUN([AX_HAVE_CPU_SET], [
+#
+# Check for the Linux functions for controlling processor affinity.
+#
+# LINUX: sched_setaffinity
+AC_CHECK_FUNCS(sched_setaffinity sched_getaffinity)
+	if test "$ac_cv_func_sched_setaffinity" = "yes" ; then
+        AC_CACHE_CHECK([whether the CPU_SET and CPU_ZERO macros are defined],
+        ac_cv_cpu_set_defined,[
+        AC_TRY_COMPILE( [#include <sched.h>],[ cpu_set_t t; CPU_ZERO(&t); CPU_SET(1,&t); ],
+	        ac_cv_cpu_set_defined=yes,ac_cv_cpu_set_defined=no)])
+        if test "$ac_cv_cpu_set_defined" = "yes" ; then
+        	AC_DEFINE(HAVE_CPU_SET_MACROS,1,[Define if CPU_SET and CPU_ZERO defined])
+        fi
+	fi
+])
\ No newline at end of file
diff --git a/configure.in b/configure.in
index d68842bdaa..a06056ce8d 100644
--- a/configure.in
+++ b/configure.in
@@ -431,9 +431,11 @@ AC_FUNC_MALLOC
 AC_TYPE_SIGNAL
 AC_FUNC_STRFTIME
 AC_CHECK_FUNCS([gethostname vasprintf mmap mlock mlockall usleep getifaddrs])
-AC_CHECK_FUNCS([sched_setscheduler sched_setaffinity setpriority setrlimit setgroups initgroups])
+AC_CHECK_FUNCS([sched_setscheduler setpriority setrlimit setgroups initgroups])
 AC_CHECK_FUNCS([wcsncmp setgroups asprintf setenv pselect gettimeofday localtime_r gmtime_r strcasecmp stricmp _stricmp])
 
+AX_HAVE_CPU_SET
+
 AC_CHECK_LIB(rt, clock_gettime, [AC_DEFINE(HAVE_CLOCK_GETTIME, 1, [Define if you have clock_gettime()])])
 AC_CHECK_LIB(rt, clock_nanosleep, [AC_DEFINE(HAVE_CLOCK_NANOSLEEP, 1, [Define if you have clock_nanosleep()])])
 AC_CHECK_FUNC(socket, , AC_CHECK_LIB(socket, socket))
diff --git a/src/switch_time.c b/src/switch_time.c
index b623abed25..42d761a937 100644
--- a/src/switch_time.c
+++ b/src/switch_time.c
@@ -537,7 +537,7 @@ SWITCH_MODULE_RUNTIME_FUNCTION(softtimer_runtime)
 	switch_time_t ts = 0, last = 0;
 	int fwd_errs = 0, rev_errs = 0;
 
-#ifdef HAVE_SCHED_SETAFFINITY
+#ifdef HAVE_CPU_SET_MACROS
 	cpu_set_t set;
 	CPU_ZERO(&set);
 	CPU_SET(0, &set);