diff --git a/configure b/configure
index b3968a85bf..31ed6254ed 100755
--- a/configure
+++ b/configure
@@ -35715,6 +35715,8 @@ esac
 
                         if test "$WXGTK3" = 1 -o "$wxUSE_MAC" = 1 ; then
         CXXWARNINGS="$CXXWARNINGS -Wno-deprecated-declarations"
+
+                        OBJCXXFLAGS="$OBJCXXFLAGS -Wno-deprecated-declarations"
     fi
 fi
 
diff --git a/configure.in b/configure.in
index 95d723a670..1290fd0f8e 100644
--- a/configure.in
+++ b/configure.in
@@ -7577,6 +7577,10 @@ elif test "$GXX" = yes ; then
     dnl other ones
     if test "$WXGTK3" = 1 -o "$wxUSE_MAC" = 1 ; then
         CXXWARNINGS="$CXXWARNINGS -Wno-deprecated-declarations"
+
+        dnl CXXWARNINGS is not used for Objective-C++ code compilation, but we
+        dnl want to avoid these warnings in it too when building wxOSX.
+        OBJCXXFLAGS="$OBJCXXFLAGS -Wno-deprecated-declarations"
     fi
 fi