diff --git a/specifications/uri-options/tests/read-preference-options.json b/specifications/uri-options/tests/read-preference-options.json
index 054f5e089ed..abbf0d0cc6e 100644
--- a/specifications/uri-options/tests/read-preference-options.json
+++ b/specifications/uri-options/tests/read-preference-options.json
@@ -36,6 +36,21 @@
         ]
       }
     },
+    {
+      "description": "Read preference tags are case sensitive",
+      "uri": "mongodb://example.com/?readPreference=secondary&readPreferenceTags=dc:NY",
+      "valid": true,
+      "warning": false,
+      "hosts": null,
+      "auth": null,
+      "options": {
+        "readPreferenceTags": [
+          {
+            "dc": "NY"
+          }
+        ]
+      }
+    },
     {
       "description": "Invalid readPreferenceTags causes a warning",
       "uri": "mongodb://example.com/?readPreferenceTags=invalid",
diff --git a/specifications/uri-options/tests/read-preference-options.yml b/specifications/uri-options/tests/read-preference-options.yml
index c7f18fe72f2..267454c0ea0 100644
--- a/specifications/uri-options/tests/read-preference-options.yml
+++ b/specifications/uri-options/tests/read-preference-options.yml
@@ -26,6 +26,17 @@ tests:
             readPreferenceTags:
                 -
                     dc: "ny"
+    -
+        description: "Read preference tags are case sensitive"
+        uri: "mongodb://example.com/?readPreference=secondary&readPreferenceTags=dc:NY"
+        valid: true
+        warning: false
+        hosts: ~
+        auth: ~
+        options:
+            readPreferenceTags:
+                -
+                    dc: "NY"
     -
         description: "Invalid readPreferenceTags causes a warning"
         uri: "mongodb://example.com/?readPreferenceTags=invalid"