diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 7f780ae8f22a..0e2c7cb4c357 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -3652,6 +3652,9 @@ static int parse_cpu_str(char *cpu_str, cpu_set_t *cpu_set, int cpu_set_size)
 		if (*next == '-')	/* no negative cpu numbers */
 			return 1;
 
+		if (*next == '\0' || *next == '\n')
+			break;
+
 		start = strtoul(next, &next, 10);
 
 		if (start >= CPU_SUBSET_MAXCPUS)