diff --git a/gcc/testsuite/g++.dg/cpp23/ext-floating15.C b/gcc/testsuite/g++.dg/cpp23/ext-floating15.C
index 316dd5abacd..6d7dc6ad682 100644
--- a/gcc/testsuite/g++.dg/cpp23/ext-floating15.C
+++ b/gcc/testsuite/g++.dg/cpp23/ext-floating15.C
@@ -1,6 +1,7 @@
 // PR c++/109278
 // { dg-do compile { target float128 } }
 // { dg-options "-w" }
+// { dg-add-options float128 }
 
 void foo (long double);	// { dg-bogus "initializing argument 1 of" }