diff --git a/Kernel/Signature.cpp b/Kernel/Signature.cpp
index 88a4581bce..d4bf336f38 100644
--- a/Kernel/Signature.cpp
+++ b/Kernel/Signature.cpp
@@ -908,7 +908,7 @@ bool Signature::symbolNeedsQuoting(vstring name, bool interpreted, unsigned arit
   CALL("Signature::symbolNeedsQuoting");
   ASS_G(name.length(),0);
 
-  if (interpreted && (name=="=" || arity==0)) {
+  if (name=="=" || (interpreted && arity==0)) {
     return false;
   }