diff --git a/compiler-rt/include/profile/InstrProfData.inc b/compiler-rt/include/profile/InstrProfData.inc
--- a/compiler-rt/include/profile/InstrProfData.inc
+++ b/compiler-rt/include/profile/InstrProfData.inc
@@ -872,7 +872,7 @@
     return Value;
   else
     // Otherwise, take to the previous power of two + 1.
-    return (1 << (64 - InstProfClzll(Value) - 1)) + 1;
+    return (UINT64_C(1) << (64 - InstProfClzll(Value) - 1)) + 1;
 }
 
 /* Return true if the range that an (observed) memop size value belongs to has