diff --git a/compiler-rt/lib/xray/xray_powerpc64.inc b/compiler-rt/lib/xray/xray_powerpc64.inc
--- a/compiler-rt/lib/xray/xray_powerpc64.inc
+++ b/compiler-rt/lib/xray/xray_powerpc64.inc
@@ -22,7 +22,7 @@
 
 uint64_t __ppc_get_timebase_freq (void)
 {
-  double tb_freq = 0.0;
+  uint64_t tb_freq = 0.0;
   size_t length = sizeof(tb_freq);
   sysctlbyname("kern.timecounter.tc.timebase.frequency", &tb_freq, &length, nullptr, 0);
   return tb_freq;