diff --git a/conf.d/48-spacing.conf b/conf.d/48-spacing.conf
new file mode 100644
index 0000000..95f394d
--- /dev/null
+++ b/conf.d/48-spacing.conf
@@ -0,0 +1,25 @@
+<?xml version="1.0"?>
+<!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
+<fontconfig>
+  <description>Add mono to the family when no generic name and spacing is 100</description>
+<!--
+  If the font has no generic name and spacing 100, add mono
+ -->
+	<match target="pattern">
+		<test qual="all" name="family" compare="not_eq">
+			<string>sans-serif</string>
+		</test>
+		<test qual="all" name="family" compare="not_eq">
+			<string>serif</string>
+		</test>
+		<test qual="all" name="family" compare="not_eq">
+			<string>monospace</string>
+		</test>
+		<test qual="all" name="spacing" compare="eq">
+			<int>100</int>
+		</test>
+		<edit name="family" mode="append_last">
+			<string>monospace</string>
+		</edit>
+	</match>
+</fontconfig>