diff --git a/testcases/realtime/lib/librttest.c b/testcases/realtime/lib/librttest.c
index 03566f36d50..99ce78b33b0 100644
--- a/testcases/realtime/lib/librttest.c
+++ b/testcases/realtime/lib/librttest.c
@@ -768,11 +768,13 @@ int get_numcpus(void)
 {
 	long numcpus_conf = sysconf(_SC_NPROCESSORS_CONF);
 	size_t size = CPU_ALLOC_SIZE(numcpus_conf);
+	int cpu_count;
 	cpu_set_t *cpuset = CPU_ALLOC(numcpus_conf);
 
 	CPU_ZERO_S(size, cpuset);
 	/* Get the number of cpus accessible to the current process */
 	sched_getaffinity(0, size, cpuset);
-
-	return CPU_COUNT_S(size, cpuset);
+	cpu_count = CPU_COUNT_S(size, cpuset);
+	CPU_FREE(cpuset);
+	return cpu_count;
 }