diff --git a/src/metamodel/RoleHOW.pir b/src/metamodel/RoleHOW.pir
index ec6ec1ad040..2fe475e0845 100644
--- a/src/metamodel/RoleHOW.pir
+++ b/src/metamodel/RoleHOW.pir
@@ -154,7 +154,24 @@ Add a method to the given meta.
     .param string name
     .param pmc meth
     $P0 = getattribute self, 'parrotclass'
+    push_eh add_fail
     addmethod $P0, name, meth
+    pop_eh
+    .return ()
+  add_fail:
+    pop_eh
+    
+    # May be that we need to merge multis.
+    $P1 = $P0.'methods'()
+    $P1 = $P1[name]
+    $I0 = isa $P1, 'MultiSub'
+    unless $I0 goto error
+    $I0 = isa meth, 'MultiSub'
+    unless $I0 goto error
+    $P1.'incorporate_candidates'(meth)
+    .return ()
+  error:
+    '&die'('Can not add two methods to a role if they are not multis')
 .end
 
 =item methods
diff --git a/src/metamodel/RoleToRoleApplier.nqp b/src/metamodel/RoleToRoleApplier.nqp
index be70bda35ea..4669be0e452 100644
--- a/src/metamodel/RoleToRoleApplier.nqp
+++ b/src/metamodel/RoleToRoleApplier.nqp
@@ -75,8 +75,19 @@ method apply($target, @composees) {
                 $target.HOW.add_method($target, $name, @add_meths[0]);
             }
             else {
-                # More than one - add to collisions list.
-                $target.HOW.add_collision($target, $name);
+                # More than one - add to collisions list unless all multi.
+                my $num_multi := 0;
+                for @add_meths {
+                    if $_.multi { $num_multi := $num_multi + 1; }
+                }
+                if +@add_meths == $num_multi {
+                    for @add_meths {
+                        $target.HOW.add_method($target, $name, $_);
+                    }
+                }
+                else {
+                    $target.HOW.add_collision($target, $name);
+                }
             }
         }
     }