diff --git a/src/emucore/OSystem.cxx b/src/emucore/OSystem.cxx
index 4993edbcb..c1159982e 100644
--- a/src/emucore/OSystem.cxx
+++ b/src/emucore/OSystem.cxx
@@ -796,7 +796,7 @@ ByteBuffer OSystem::openROM(const FilesystemNode& rom, size_t& size,
     if((size = rom.read(image, sizeToRead)) == 0)
       return nullptr;
   }
-  catch(const runtime_error& e)
+  catch(const runtime_error&)
   {
     if(showErrorMessage)  // If caller wants error messages, pass it back
       throw;