diff --git a/package.json b/package.json
index 6ab89c9f3..d7540477b 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,7 @@
     "scratch-render": "latest",
     "script-loader": "0.7.0",
     "stats.js": "0.17.0",
-    "tap": "10.0.2",
+    "tap": "10.1.0",
     "travis-after-all": "1.4.4",
     "webpack": "2.2.1",
     "webpack-dev-server": "1.16.3"
diff --git a/src/engine/runtime.js b/src/engine/runtime.js
index f196a6a69..fc3b17a06 100644
--- a/src/engine/runtime.js
+++ b/src/engine/runtime.js
@@ -439,6 +439,11 @@ Runtime.prototype.startHats = function (requestedHatOpcode,
     }
     var instance = this;
     var newThreads = [];
+
+    for (var opts in optMatchFields) {
+        optMatchFields[opts] = optMatchFields[opts].toUpperCase();
+    }
+
     // Consider all scripts, looking for hats with opcode `requestedHatOpcode`.
     this.allScriptsDo(function (topBlockId, target) {
         var potentialHatOpcode = target.blocks.getBlock(topBlockId).opcode;
@@ -466,7 +471,7 @@ Runtime.prototype.startHats = function (requestedHatOpcode,
 
         if (optMatchFields) {
             for (var matchField in optMatchFields) {
-                if (hatFields[matchField].value !==
+                if (hatFields[matchField].value.toUpperCase() !==
                     optMatchFields[matchField]) {
                     // Field mismatch.
                     return;