diff --git a/llvm/utils/gn/secondary/llvm/tools/llvm-reduce/BUILD.gn b/llvm/utils/gn/secondary/llvm/tools/llvm-reduce/BUILD.gn
index b76e0311d7fe7..281a1840ce9bd 100644
--- a/llvm/utils/gn/secondary/llvm/tools/llvm-reduce/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/tools/llvm-reduce/BUILD.gn
@@ -10,6 +10,7 @@ executable("llvm-reduce") {
   include_dirs = [ "." ]
   sources = [
     "DeltaManager.cpp",
+    "ReducerWorkItem.cpp",
     "TestRunner.cpp",
     "deltas/Delta.cpp",
     "deltas/ReduceAliases.cpp",
@@ -22,6 +23,7 @@ executable("llvm-reduce") {
     "deltas/ReduceGlobalVarInitializers.cpp",
     "deltas/ReduceGlobalVars.cpp",
     "deltas/ReduceInstructions.cpp",
+    "deltas/ReduceInstructionsMIR.cpp",
     "deltas/ReduceMetadata.cpp",
     "deltas/ReduceModuleData.cpp",
     "deltas/ReduceOperandBundles.cpp",