diff --git a/lldb/include/lldb/Target/ProcessInfo.h b/lldb/include/lldb/Target/ProcessInfo.h
index 0570cfc98651..1539e043d6fc 100644
--- a/lldb/include/lldb/Target/ProcessInfo.h
+++ b/lldb/include/lldb/Target/ProcessInfo.h
@@ -107,7 +107,7 @@ namespace lldb_private
         }
 
         void
-        SetArchitecture (ArchSpec arch)
+        SetArchitecture (const ArchSpec& arch)
         {
             m_arch = arch;
         }