diff --git a/libstdc++-v3/testsuite/27_io/basic_istream/ignore/char/94749.cc b/libstdc++-v3/testsuite/27_io/basic_istream/ignore/char/94749.cc
index 32b604d5b15..21097c2bff1 100644
--- a/libstdc++-v3/testsuite/27_io/basic_istream/ignore/char/94749.cc
+++ b/libstdc++-v3/testsuite/27_io/basic_istream/ignore/char/94749.cc
@@ -165,7 +165,7 @@ test05()
   VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
   VERIFY(in.get() == T::eof());
 
-  delete in.rdbuf(nullptr);
+  delete in.rdbuf(0);
 }
 
 void
@@ -210,7 +210,7 @@ test06()
   VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
   VERIFY(in.get() == T::eof());
 
-  delete in.rdbuf(nullptr);
+  delete in.rdbuf(0);
 }
 
 int
diff --git a/libstdc++-v3/testsuite/27_io/basic_istream/ignore/wchar_t/94749.cc b/libstdc++-v3/testsuite/27_io/basic_istream/ignore/wchar_t/94749.cc
index 23d3a0ad170..2473588d307 100644
--- a/libstdc++-v3/testsuite/27_io/basic_istream/ignore/wchar_t/94749.cc
+++ b/libstdc++-v3/testsuite/27_io/basic_istream/ignore/wchar_t/94749.cc
@@ -165,7 +165,7 @@ test05()
   VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
   VERIFY(in.get() == T::eof());
 
-  delete in.rdbuf(nullptr);
+  delete in.rdbuf(0);
 }
 
 void
@@ -210,7 +210,7 @@ test06()
   VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
   VERIFY(in.get() == T::eof());
 
-  delete in.rdbuf(nullptr);
+  delete in.rdbuf(0);
 }
 
 int