diff --git a/configure b/configure
index d68bb65db2..07919ab2b6 100755
--- a/configure
+++ b/configure
@@ -39635,9 +39635,9 @@ else
 sed 's/^/| /' conftest.$ac_ext >&5
 
 
-                                                                                                                                                                        CFLAGS_OLD="$CFLAGS"
+                                                                                                                                                                        CXXFLAGS_OLD="$CXXFLAGS"
                         if test "$GCC" = yes ; then
-                            CFLAGS="$CFLAGS -Werror"
+                            CXXFLAGS="$CXXFLAGS -Werror"
                         fi
 
                         cat >conftest.$ac_ext <<_ACEOF
@@ -39742,7 +39742,7 @@ rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
 fi
 rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
 
-                        CFLAGS="$CFLAGS_OLD"
+                        CXXFLAGS="$CXXFLAGS_OLD"
 
 
 fi
@@ -39816,9 +39816,9 @@ else
 sed 's/^/| /' conftest.$ac_ext >&5
 
 
-                                                                                                                                                                        CFLAGS_OLD="$CFLAGS"
+                                                                                                                                                                        CXXFLAGS_OLD="$CXXFLAGS"
                         if test "$GCC" = yes ; then
-                            CFLAGS="$CFLAGS -Werror"
+                            CXXFLAGS="$CXXFLAGS -Werror"
                         fi
 
                         cat >conftest.$ac_ext <<_ACEOF
@@ -39923,7 +39923,7 @@ rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
 fi
 rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
 
-                        CFLAGS="$CFLAGS_OLD"
+                        CXXFLAGS="$CXXFLAGS_OLD"
 
 
 fi
diff --git a/configure.in b/configure.in
index d2ba941656..60b52e4fe0 100644
--- a/configure.in
+++ b/configure.in
@@ -5615,9 +5615,9 @@ if test "$wxUSE_SOCKETS" = "yes" ; then
                         dnl converting between incompatible pointer types, so
                         dnl try to use it to get the correct behaviour at
                         dnl least with gcc (otherwise we'd always use size_t)
-                        CFLAGS_OLD="$CFLAGS"
+                        CXXFLAGS_OLD="$CXXFLAGS"
                         if test "$GCC" = yes ; then
-                            CFLAGS="$CFLAGS -Werror"
+                            CXXFLAGS="$CXXFLAGS -Werror"
                         fi
 
                         AC_TRY_COMPILE(
@@ -5644,7 +5644,7 @@ if test "$wxUSE_SOCKETS" = "yes" ; then
                             )
                         )
 
-                        CFLAGS="$CFLAGS_OLD"
+                        CXXFLAGS="$CXXFLAGS_OLD"
                     ]
                 )
             ])
@@ -5676,9 +5676,9 @@ if test "$wxUSE_SOCKETS" = "yes" ; then
                         dnl converting between incompatible pointer types, so
                         dnl try to use it to get the correct behaviour at
                         dnl least with gcc (otherwise we'd always use size_t)
-                        CFLAGS_OLD="$CFLAGS"
+                        CXXFLAGS_OLD="$CXXFLAGS"
                         if test "$GCC" = yes ; then
-                            CFLAGS="$CFLAGS -Werror"
+                            CXXFLAGS="$CXXFLAGS -Werror"
                         fi
 
                         AC_TRY_COMPILE(
@@ -5705,7 +5705,7 @@ if test "$wxUSE_SOCKETS" = "yes" ; then
                             )
                         )
 
-                        CFLAGS="$CFLAGS_OLD"
+                        CXXFLAGS="$CXXFLAGS_OLD"
                     ]
                 )
             ])