diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index ab2f682..d5d6a3d 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -73,8 +73,8 @@
 char *progname;
 
 int num_cpus;
-cpu_set_t *cpu_mask;
-size_t cpu_mask_size;
+cpu_set_t *cpu_present_set, *cpu_mask;
+size_t cpu_present_setsize, cpu_mask_size;
 
 struct counters {
 	unsigned long long tsc;		/* per thread */
@@ -103,6 +103,12 @@
 struct timeval tv_odd;
 struct timeval tv_delta;
 
+int mark_cpu_present(int pkg, int core, int cpu)
+{
+	CPU_SET_S(cpu, cpu_present_setsize, cpu_present_set);
+	return 0;
+}
+
 /*
  * cpu_mask_init(ncpus)
  *
@@ -118,6 +124,18 @@
 	}
 	cpu_mask_size = CPU_ALLOC_SIZE(ncpus);
 	CPU_ZERO_S(cpu_mask_size, cpu_mask);
+
+	/*
+	 * Allocate and initialize cpu_present_set
+	 */
+	cpu_present_set = CPU_ALLOC(ncpus);
+	if (cpu_present_set == NULL) {
+		perror("CPU_ALLOC");
+		exit(3);
+	}
+	cpu_present_setsize = CPU_ALLOC_SIZE(ncpus);
+	CPU_ZERO_S(cpu_present_setsize, cpu_present_set);
+	for_all_cpus(mark_cpu_present);
 }
 
 void cpu_mask_uninit()
@@ -125,6 +143,9 @@
 	CPU_FREE(cpu_mask);
 	cpu_mask = NULL;
 	cpu_mask_size = 0;
+	CPU_FREE(cpu_present_set);
+	cpu_present_set = NULL;
+	cpu_present_setsize = 0;
 }
 
 int cpu_migrate(int cpu)
@@ -1047,6 +1068,9 @@
 	int retval;
 	pid_t child_pid;
 	get_counters(cnt_even);
+
+        /* clear affinity side-effect of get_counters() */
+        sched_setaffinity(0, cpu_present_setsize, cpu_present_set);
 	gettimeofday(&tv_even, (struct timezone *)NULL);
 
 	child_pid = fork();