diff --git a/llvm/tools/llvm-objcopy/ConfigManager.cpp b/llvm/tools/llvm-objcopy/ConfigManager.cpp
--- a/llvm/tools/llvm-objcopy/ConfigManager.cpp
+++ b/llvm/tools/llvm-objcopy/ConfigManager.cpp
@@ -582,11 +582,11 @@
 }
 
 Expected<const MachOConfig &> ConfigManager::getMachOConfig() const {
-  if (!Common.SplitDWO.empty() || !Common.SymbolsPrefix.empty() ||
-      !Common.AllocSectionsPrefix.empty() || !Common.KeepSection.empty() ||
-      !Common.SymbolsToGlobalize.empty() || !Common.SymbolsToKeep.empty() ||
-      !Common.SymbolsToLocalize.empty() || !Common.SymbolsToWeaken.empty() ||
-      !Common.SymbolsToKeepGlobal.empty() || !Common.SectionsToRename.empty() ||
+  if (!Common.SplitDWO.empty() || !Common.AllocSectionsPrefix.empty() ||
+      !Common.KeepSection.empty() || !Common.SymbolsToGlobalize.empty() ||
+      !Common.SymbolsToKeep.empty() || !Common.SymbolsToLocalize.empty() ||
+      !Common.SymbolsToWeaken.empty() || !Common.SymbolsToKeepGlobal.empty() ||
+      !Common.SectionsToRename.empty() ||
       !Common.UnneededSymbolsToRemove.empty() ||
       !Common.SetSectionAlignment.empty() || !Common.SetSectionFlags.empty() ||
       Common.ExtractDWO || Common.PreserveDates || Common.StripAllGNU ||
diff --git a/llvm/tools/llvm-objcopy/MachO/MachOObjcopy.cpp b/llvm/tools/llvm-objcopy/MachO/MachOObjcopy.cpp
--- a/llvm/tools/llvm-objcopy/MachO/MachOObjcopy.cpp
+++ b/llvm/tools/llvm-objcopy/MachO/MachOObjcopy.cpp
@@ -96,6 +96,9 @@
     auto I = Config.SymbolsToRename.find(Sym.Name);
     if (I != Config.SymbolsToRename.end())
       Sym.Name = std::string(I->getValue());
+
+    if (!Config.SymbolsPrefix.empty() && !Sym.isUndefinedSymbol())
+      Sym.Name = (Config.SymbolsPrefix + Sym.Name).str();
   }
 
   auto RemovePred = [Config, MachOConfig,