diff --git a/llvm_util/llvm_optimizer.cpp b/llvm_util/llvm_optimizer.cpp
index cd5e8108d..c37e7249d 100644
--- a/llvm_util/llvm_optimizer.cpp
+++ b/llvm_util/llvm_optimizer.cpp
@@ -56,10 +56,6 @@ string optimize_module(llvm::Module &M, string_view optArgs) {
     MPM = PB.buildPerModuleDefaultPipeline(OptimizationLevel::O1);
   } else if (optArgs == "O0") {
     MPM = PB.buildPerModuleDefaultPipeline(OptimizationLevel::O0);
-  } else if (optArgs == "Os") {
-    MPM = PB.buildPerModuleDefaultPipeline(OptimizationLevel::Os);
-  } else if (optArgs == "Oz") {
-    MPM = PB.buildPerModuleDefaultPipeline(OptimizationLevel::Oz);
   } else {
     if (auto Err = PB.parsePassPipeline(MPM, optArgs))
       return toString(std::move(Err));
@@ -68,4 +64,4 @@ string optimize_module(llvm::Module &M, string_view optArgs) {
   return {};
 }
 
-}
+} // namespace llvm_util
diff --git a/tests/opt-tv/npm-Os.opt.ll b/tests/opt-tv/npm-Os.opt.ll
deleted file mode 100644
index a6becd871..000000000
--- a/tests/opt-tv/npm-Os.opt.ll
+++ /dev/null
@@ -1,7 +0,0 @@
-; TEST-ARGS: -passes=default<Os>
-
-define i32 @f() {
-  ret i32 1
-}
-
-; CHECK: Transformation seems