diff --git a/gcc/testsuite/g++.dg/warn/Wfree-nonheap-object-3.C b/gcc/testsuite/g++.dg/warn/Wfree-nonheap-object-3.C
index 47f97dcb636..66f07aaa749 100644
--- a/gcc/testsuite/g++.dg/warn/Wfree-nonheap-object-3.C
+++ b/gcc/testsuite/g++.dg/warn/Wfree-nonheap-object-3.C
@@ -4,6 +4,8 @@
    { dg-do compile { target c++11 } }
    { dg-options "-O2 -Wall" } */
 
+#define _GLIBCXX_USE_CXX11_ABI 1
+
 #include <memory>
 #include <string>
 
diff --git a/gcc/testsuite/g++.dg/torture/pr106922.C b/gcc/testsuite/g++.dg/torture/pr106922.C
index 046fc6cce76..4214a31f276 100644
--- a/gcc/testsuite/g++.dg/torture/pr106922.C
+++ b/gcc/testsuite/g++.dg/torture/pr106922.C
@@ -4,6 +4,8 @@
 // -O1 doesn't iterate VN and thus has bogus uninit diagnostics
 // { dg-skip-if "" { *-*-* } { "-O1" } { "" } }
 
+#define _GLIBCXX_USE_CXX11_ABI 1
+
 #include <vector>
 
 #include <optional>