diff --git a/modules/conop/src/compound.hh b/modules/conop/src/compound.hh
index 650271b5f0ac9a9448a5dcd598fa791191bba17a..f65d4864f9eecf4aee469c59e2d3afb9ef739b68 100644
--- a/modules/conop/src/compound.hh
+++ b/modules/conop/src/compound.hh
@@ -100,7 +100,7 @@ struct DLLEXPORT_OST_CONOP AtomSpec {
   bool operator==(const AtomSpec& rhs) const {
     return ordinal==rhs.ordinal && name==rhs.name && alt_name==rhs.alt_name &&
            element==rhs.element && is_leaving==rhs.is_leaving && 
-           rhs.is_aromatic==rhs.is_aromatic && charge==rhs.charge;
+           is_aromatic==rhs.is_aromatic && charge==rhs.charge;
   }
   bool operator!=(const AtomSpec& rhs) const {
     return !this->operator==(rhs);