diff --git a/llvm/lib/ExecutionEngine/Orc/Core.cpp b/llvm/lib/ExecutionEngine/Orc/Core.cpp
index c5730378fa60..2dd491e85c02 100644
--- a/llvm/lib/ExecutionEngine/Orc/Core.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/Core.cpp
@@ -282,6 +282,7 @@ Error MaterializationResponsibility::defineMaterializing(
   // symbol error.
   for (auto &KV : NewSymbolFlags) {
     auto I = SymbolFlags.insert(KV).first;
+    (void)I;
 #ifndef NDEBUG
     I->second |= JITSymbolFlags::Materializing;
 #endif