diff --git a/lib/src/catalan/DiffCat.gf b/lib/src/catalan/DiffCat.gf
index 3f9abfcbc..da5683d84 100644
--- a/lib/src/catalan/DiffCat.gf
+++ b/lib/src/catalan/DiffCat.gf
@@ -170,7 +170,7 @@ oper
       _ => False
       } ;
 
-    auxPassive : Verb = copula ;
+    auxPassive : Verb = verbBeschH (estar_54 "estar") ;
 
     copula = verbBeschH (ser_52 "ser") ;
 
diff --git a/lib/src/spanish/DiffSpa.gf b/lib/src/spanish/DiffSpa.gf
index 2c64f94e7..59957bec3 100644
--- a/lib/src/spanish/DiffSpa.gf
+++ b/lib/src/spanish/DiffSpa.gf
@@ -172,7 +172,7 @@ instance DiffSpa of DiffRomance = open CommonRomance, PhonoSpa, BeschSpa, Prelud
       _ => False
       } ;
 
-    auxPassive : Verb = copula ;
+    auxPassive : Verb = verbBeschH (estar_2 "estar") ;
 
     copula = verbBeschH (ser_1 "ser") ;