--- a/src/comgr-compiler.cpp
+++ b/src/comgr-compiler.cpp
@@ -244,13 +244,12 @@ bool AssemblerInvocation::createFromArgs(AssemblerInvocation &Opts,
                                      OPT_compress_debug_sections_EQ)) {
     if (A->getOption().getID() == OPT_compress_debug_sections) {
       // TODO: be more clever about the compression type auto-detection
-      Opts.CompressDebugSections = llvm::DebugCompressionType::GNU;
+      Opts.CompressDebugSections = llvm::DebugCompressionType::Z;
     } else {
       Opts.CompressDebugSections =
           llvm::StringSwitch<llvm::DebugCompressionType>(A->getValue())
               .Case("none", llvm::DebugCompressionType::None)
               .Case("zlib", llvm::DebugCompressionType::Z)
-              .Case("zlib-gnu", llvm::DebugCompressionType::GNU)
               .Default(llvm::DebugCompressionType::None);
     }
   }