diff --git a/llvm/utils/gn/secondary/llvm/lib/CodeGen/GlobalISel/BUILD.gn b/llvm/utils/gn/secondary/llvm/lib/CodeGen/GlobalISel/BUILD.gn
index 7e6ecad0e116..dcfc1d1c3581 100644
--- a/llvm/utils/gn/secondary/llvm/lib/CodeGen/GlobalISel/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/lib/CodeGen/GlobalISel/BUILD.gn
@@ -18,6 +18,7 @@ static_library("GlobalISel") {
     "Combiner.cpp",
     "CombinerHelper.cpp",
     "GISelChangeObserver.cpp",
+    "GISelKnownBits.cpp",
     "GlobalISel.cpp",
     "IRTranslator.cpp",
     "InstructionSelect.cpp",
diff --git a/llvm/utils/gn/secondary/llvm/unittests/CodeGen/GlobalISel/BUILD.gn b/llvm/utils/gn/secondary/llvm/unittests/CodeGen/GlobalISel/BUILD.gn
index 3afd244d055f..7655b56ce261 100644
--- a/llvm/utils/gn/secondary/llvm/unittests/CodeGen/GlobalISel/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/unittests/CodeGen/GlobalISel/BUILD.gn
@@ -14,6 +14,7 @@ unittest("GlobalISelTests") {
   sources = [
     "CSETest.cpp",
     "GISelMITest.cpp",
+    "KnownBitsTest.cpp",
     "LegalizerHelperTest.cpp",
     "LegalizerInfoTest.cpp",
     "MachineIRBuilderTest.cpp",