--- a/fontconfig/urw-nimbus-mono-ps.conf
+++ b/fontconfig/urw-nimbus-mono-ps.conf
@@ -1,6 +1,22 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE fontconfig SYSTEM "fonts.dtd">
 <fontconfig>
+<!-- Substitution with DejaVu Sans Mono. Nimbus Mono PS is not properly monospaced. -->
++<match>
++    <test name="family"><string>Nimbus Mono PS</string></test>
++    <edit name="family"><string>DejaVu Sans Mono</string></edit>
++</match>
+
++<match>
++    <test name="family"><string>Courier</string></test>
++    <edit name="family"><string>DejaVu Sans Mono</string></edit>
++</match>
+
++<match>
++    <test name="family"><string>Nimbus Mono L</string></test>
++    <edit name="family"><string>DejaVu Sans Mono</string></edit>
++</match>
+
   <!-- Generic name aliasing -->
   <alias>
     <family>monospace</family>