diff --git a/src/mtype.c b/src/mtype.c
index de48960f1d3e..cc225fc63d93 100644
--- a/src/mtype.c
+++ b/src/mtype.c
@@ -5873,7 +5873,13 @@ MATCH TypeFunction::callMatch(Type *tthis, Expressions *args, int flag)
                 goto Nomatch;
         }
         else if (p->storageClass & STCout)
-        {   if (m && !arg->isLvalue())
+        {
+            if (m && !arg->isLvalue())
+                goto Nomatch;
+
+            Type *targb = targ->toBasetype();
+            Type *tprmb = tprm->toBasetype();
+            if (!targb->constConv(tprmb))
                 goto Nomatch;
         }
         }
diff --git a/src/template.c b/src/template.c
index 46ef9032720b..652e1eade953 100644
--- a/src/template.c
+++ b/src/template.c
@@ -2054,7 +2054,7 @@ void functionResolve(Match *m, Dsymbol *dstart, Loc loc, Scope *sc,
         if (tiargs && tiargs->dim > 0)
             return 0;
 
-        //printf("fd = %s %s\n", fd->toChars(), fd->type->toChars());
+        //printf("fd = %s %s, fargs = %s\n", fd->toChars(), fd->type->toChars(), fargs->toChars());
         m->anyf = fd;
         TypeFunction *tf = (TypeFunction *)fd->type;
 
diff --git a/test/runnable/overload.d b/test/runnable/overload.d
index c9d04d6f7ecb..db4243b593cf 100644
--- a/test/runnable/overload.d
+++ b/test/runnable/overload.d
@@ -1008,6 +1008,22 @@ void test11785()
     input.read(v);
 }
 
+/***************************************************/
+// 11915
+
+int f11915(    int) { return 1; }
+int f11915(ref int) { return 2; }
+
+int g11915(    int) { return 1; }
+int g11915(out int) { return 2; }
+
+void test11915()
+{
+    const int n = 1;
+    assert(f11915(n) == 1);
+    assert(g11915(n) == 1);
+}
+
 /***************************************************/
 // 11916
 
@@ -1068,6 +1084,7 @@ int main()
     test10658a();
     test10658b();
     test11785();
+    test11915();
     test11916();
 
     printf("Success\n");