diff --git a/external/mit/xorg/lib/fontconfig/etc/fonts.conf b/external/mit/xorg/lib/fontconfig/etc/fonts.conf
index 6960b0d5e8c2..f3d1448dc843 100644
--- a/external/mit/xorg/lib/fontconfig/etc/fonts.conf
+++ b/external/mit/xorg/lib/fontconfig/etc/fonts.conf
@@ -65,6 +65,33 @@
 		</edit>
 	</match>
 
+<!--
+  Reject X11 bitmap fonts which may be selected in place of scalable
+  proportional fonts, e.g. on the web.
+
+  Mostly these are included as scalable system fonts in macOS.
+-->
+	<selectfont>
+		<rejectfont>
+			<pattern>
+			    <patelt name="family"><string>Charter</string></patelt>
+			    <patelt name="scalable"><bool>false</bool></patelt>
+			</pattern>
+			<pattern>
+			    <patelt name="family"><string>Courier</string></patelt>
+			    <patelt name="scalable"><bool>false</bool></patelt>
+			</pattern>
+			<pattern>
+			    <patelt name="family"><string>Helvetica</string></patelt>
+			    <patelt name="scalable"><bool>false</bool></patelt>
+			</pattern>
+			<pattern>
+			    <patelt name="family"><string>Times</string></patelt>
+			    <patelt name="scalable"><bool>false</bool></patelt>
+			</pattern>
+		</rejectfont>
+    </selectfont>
+
 <!--
   Load local system customization file
 -->