diff --git a/llvm/utils/gn/secondary/llvm/unittests/SandboxIR/BUILD.gn b/llvm/utils/gn/secondary/llvm/unittests/SandboxIR/BUILD.gn
index 578b2b18d6ee..5f2bf7ed3646 100644
--- a/llvm/utils/gn/secondary/llvm/unittests/SandboxIR/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/unittests/SandboxIR/BUILD.gn
@@ -9,6 +9,7 @@ unittest("SandboxIRTests") {
   ]
   sources = [
     "IntrinsicInstTest.cpp",
+    "OperatorTest.cpp",
     "PassTest.cpp",
     "RegionTest.cpp",
     "SandboxIRTest.cpp",