diff --git a/AUTHORS b/AUTHORS
index 988ad8164d..b0c7f19bdf 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -18,6 +18,7 @@ Adrián Gómez Llorente <adgllorente@gmail.com>
 Alex Jones <alexedwardjones@gmail.com>
 Alugha GmbH <*@alugha.com>
 Alvaro Velad Galvan <alvaro.velad@mirada.tv>
+Anthony Stansbridge <github@anthonystansbridge.co.uk>
 Bonnier Broadcasting <*@bonnierbroadcasting.com>
 Bryan Huh <bhh1988@gmail.com>
 Esteban Dosztal <edosztal@gmail.com>
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 667d55d54d..98777f0720 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -26,6 +26,7 @@ Aaron Vaage <vaage@google.com>
 Alex Jones <alexedwardjones@gmail.com>
 Alvaro Velad Galvan <alvaro.velad@mirada.tv>
 Andy Hochhaus <ahochhaus@samegoal.com>
+Anthony Stansbridge <github@anthonystansbridge.co.uk>
 Ashutosh Kumar Mukhiya <ashukm4@gmail.com>
 Benjamin Wallberg <benjamin.wallberg@bonnierbroadcasting.com>
 Boris Cupac <borisrt2309@gmail.com>
diff --git a/lib/media/drm_engine.js b/lib/media/drm_engine.js
index 7682938cf6..fac5a0b96a 100644
--- a/lib/media/drm_engine.js
+++ b/lib/media/drm_engine.js
@@ -582,7 +582,7 @@ shaka.media.DrmEngine = class {
       return true;
     }
 
-    return this.supportedTypes_.has(contentType);
+    return this.supportedTypes_.has(contentType.toLowerCase());
   }
 
   /**
@@ -831,11 +831,11 @@ shaka.media.DrmEngine = class {
       const videoCaps = realConfig.videoCapabilities || [];
 
       for (const cap of audioCaps) {
-        this.supportedTypes_.add(cap.contentType);
+        this.supportedTypes_.add(cap.contentType.toLowerCase());
       }
 
       for (const cap of videoCaps) {
-        this.supportedTypes_.add(cap.contentType);
+        this.supportedTypes_.add(cap.contentType.toLowerCase());
       }
 
       goog.asserts.assert(this.supportedTypes_.size,
diff --git a/test/media/drm_engine_unit.js b/test/media/drm_engine_unit.js
index 7d5807f878..0098f2d355 100644
--- a/test/media/drm_engine_unit.js
+++ b/test/media/drm_engine_unit.js
@@ -260,6 +260,7 @@ describe('DrmEngine', () => {
       expect(drmEngine.initialized()).toBe(true);
       expect(drmEngine.willSupport('audio/webm')).toBeTruthy();
       expect(drmEngine.willSupport('video/mp4; codecs="fake"')).toBeTruthy();
+      expect(drmEngine.willSupport('video/mp4; codecs="FAKE"')).toBeTruthy();
 
       // Because DrmEngine will err on being too accepting, make sure it will
       // reject something. However, we can only check that it is actually