diff --git a/llvm/utils/gn/secondary/lldb/source/API/BUILD.gn b/llvm/utils/gn/secondary/lldb/source/API/BUILD.gn
index a1233f022c6eb..22eedc1571d4f 100644
--- a/llvm/utils/gn/secondary/lldb/source/API/BUILD.gn
+++ b/llvm/utils/gn/secondary/lldb/source/API/BUILD.gn
@@ -62,6 +62,7 @@ target(liblldb_type, "liblldb") {
     "SBFile.cpp",
     "SBFileSpec.cpp",
     "SBFileSpecList.cpp",
+    "SBFormat.cpp",
     "SBFrame.cpp",
     "SBFunction.cpp",
     "SBHostOS.cpp",