diff --git a/tools/testing/selftests/intel_pstate/aperf.c b/tools/testing/selftests/intel_pstate/aperf.c
index 6046e183f4add3276adbbf4722f65435548f8a96..cd72f3dc83e9dec7ba51c38c674447c0174ff5b4 100644
--- a/tools/testing/selftests/intel_pstate/aperf.c
+++ b/tools/testing/selftests/intel_pstate/aperf.c
@@ -14,7 +14,7 @@ void usage(char *name) {
 }
 
 int main(int argc, char **argv) {
-	int i, cpu, fd;
+	unsigned int i, cpu, fd;
 	char msr_file_name[64];
 	long long tsc, old_tsc, new_tsc;
 	long long aperf, old_aperf, new_aperf;