diff --git a/lib/VMCore/DataLayout.cpp b/lib/VMCore/DataLayout.cpp
index 540f4de2f61..b39aa271f3a 100644
--- a/lib/VMCore/DataLayout.cpp
+++ b/lib/VMCore/DataLayout.cpp
@@ -184,7 +184,7 @@ static unsigned getInt(StringRef R) {
   if (R.empty())
     return 0;
   unsigned Result;
-  bool error = R.getAsInteger(10, Result);
+  bool error = R.getAsInteger(10, Result); (void)error;
   assert(!error && "not a number, or does not fit in an unsigned int");
   return Result;
 }