diff --git a/llvm/utils/gn/secondary/lldb/source/Commands/BUILD.gn b/llvm/utils/gn/secondary/lldb/source/Commands/BUILD.gn
index 08461bfd517ed4..6848c2a8fb63b5 100644
--- a/llvm/utils/gn/secondary/lldb/source/Commands/BUILD.gn
+++ b/llvm/utils/gn/secondary/lldb/source/Commands/BUILD.gn
@@ -34,6 +34,7 @@ static_library("Commands") {
     "CommandObjectBreakpoint.cpp",
     "CommandObjectBreakpointCommand.cpp",
     "CommandObjectCommands.cpp",
+    "CommandObjectDiagnostics.cpp",
     "CommandObjectDisassemble.cpp",
     "CommandObjectExpression.cpp",
     "CommandObjectFrame.cpp",