diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index cdd67186..921c7ed2 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -3106,6 +3106,7 @@ XML:
   - .dita
   - .ditamap
   - .ditaval
+  - .dll.config
   - .filters
   - .fsproj
   - .glade
diff --git a/samples/XML/libsomething.dll.config b/samples/XML/libsomething.dll.config
new file mode 100644
index 00000000..3d54afea
--- /dev/null
+++ b/samples/XML/libsomething.dll.config
@@ -0,0 +1,6 @@
+<configuration>
+  <dllmap dll="libsomething">
+    <dllentry dll="libdifferent.so" name="somefunction" target="differentfunction" />
+    <dllentry os="solaris,freebsd" dll="libanother.so" name="somefunction" target="differentfunction" />
+  </dllmap>
+</configuration>