diff --git a/sal/qa/rtl/strings/test_oustring_compare.cxx b/sal/qa/rtl/strings/test_oustring_compare.cxx
index e8f733455e55..121d6604e4a2 100644
--- a/sal/qa/rtl/strings/test_oustring_compare.cxx
+++ b/sal/qa/rtl/strings/test_oustring_compare.cxx
@@ -29,8 +29,10 @@
 // MARKER(update_precomp.py): autogen include statement, do not remove
 #include "precompiled_sal.hxx"
 
+#include "preextstl.h"
 #include <cppunit/TestFixture.h>
 #include <cppunit/extensions/HelperMacros.h>
+#include "postextstl.h"
 #include "rtl/string.h"
 #include "rtl/ustring.hxx"
 
diff --git a/sal/qa/rtl/strings/test_oustring_endswith.cxx b/sal/qa/rtl/strings/test_oustring_endswith.cxx
index 7a076536e69a..6747e820ec2e 100644
--- a/sal/qa/rtl/strings/test_oustring_endswith.cxx
+++ b/sal/qa/rtl/strings/test_oustring_endswith.cxx
@@ -29,8 +29,10 @@
 // MARKER(update_precomp.py): autogen include statement, do not remove
 #include "precompiled_sal.hxx"
 
+#include "preextstl.h"
 #include <cppunit/TestFixture.h>
 #include <cppunit/extensions/HelperMacros.h>
+#include "postextstl.h"
 #include "rtl/strbuf.hxx"
 #include "rtl/string.h"
 #include "rtl/string.hxx"
diff --git a/sal/qa/rtl/strings/test_oustring_noadditional.cxx b/sal/qa/rtl/strings/test_oustring_noadditional.cxx
index 18e8a634460b..306b8c6140f6 100644
--- a/sal/qa/rtl/strings/test_oustring_noadditional.cxx
+++ b/sal/qa/rtl/strings/test_oustring_noadditional.cxx
@@ -29,7 +29,9 @@
 // MARKER(update_precomp.py): autogen include statement, do not remove
 #include "precompiled_sal.hxx"
 
+#include "preextstl.h"
 #include <cppunit/plugin/TestPlugIn.h>
+#include "postextstl.h"
 
 CPPUNIT_PLUGIN_IMPLEMENT();
 
diff --git a/sal/qa/rtl/strings/test_oustringbuffer_utf32.cxx b/sal/qa/rtl/strings/test_oustringbuffer_utf32.cxx
index 07661b3d9235..72536f2fde21 100644
--- a/sal/qa/rtl/strings/test_oustringbuffer_utf32.cxx
+++ b/sal/qa/rtl/strings/test_oustringbuffer_utf32.cxx
@@ -29,9 +29,11 @@
 // MARKER(update_precomp.py): autogen include statement, do not remove
 #include "precompiled_sal.hxx"
 
+#include "preextstl.h"
 #include <cppunit/TestFixture.h>
 #include <cppunit/TestAssert.h>
 #include <cppunit/extensions/HelperMacros.h>
+#include "postextstl.h"
 #include "rtl/strbuf.hxx"
 #include "rtl/ustrbuf.hxx"
 #include "rtl/ustring.h"