Index: lldb/source/Core/FormatEntity.cpp
--- lldb/source/Core/FormatEntity.cpp.orig
+++ lldb/source/Core/FormatEntity.cpp
@@ -1254,7 +1254,8 @@ bool FormatEntity::Format(const Entry &entry, Stream &
                                               : llvm::Triple::UnknownOS;
             if ((ostype == llvm::Triple::FreeBSD) ||
                 (ostype == llvm::Triple::Linux) ||
-                (ostype == llvm::Triple::NetBSD)) {
+                (ostype == llvm::Triple::NetBSD) ||
+                (ostype == llvm::Triple::OpenBSD)) {
               format = "%" PRIu64;
             }
           } else {
