diff --git a/compiler-rt/test/sanitizer_common/TestCases/Linux/pthread_getaffinity_np.cpp b/compiler-rt/test/sanitizer_common/TestCases/Linux/pthread_getaffinity_np.cpp
--- a/compiler-rt/test/sanitizer_common/TestCases/Linux/pthread_getaffinity_np.cpp
+++ b/compiler-rt/test/sanitizer_common/TestCases/Linux/pthread_getaffinity_np.cpp
@@ -17,16 +17,11 @@
 #include <sanitizer/msan_interface.h>
 
 int main() {
-  cpu_set_t set_x;
+  cpu_set_t set_x[4];
   pthread_t tid = pthread_self();
-  int res = pthread_getaffinity_np(tid, sizeof(set_x), &set_x);
-  if (res != 0) {
-    fprintf(stderr, "tid: %lu\n", tid);
-    fprintf(stderr, "sizeof(set_x): %d\n", sizeof(set_x));
-    fprintf(stderr, "res: %d\n", res);
-  }
+  int res = pthread_getaffinity_np(tid, sizeof(set_x), set_x);
   assert(res == 0);
-  assert(CPU_COUNT_S(sizeof(set_x), &set_x) == get_nprocs());
+  assert(CPU_COUNT_S(sizeof(set_x), set_x) == get_nprocs());
 
   return 0;
 }