diff --git a/Source/WebCore/platform/encryptedmedia/CDMPrivate.cpp b/Source/WebCore/platform/encryptedmedia/CDMPrivate.cpp
index 88ff86897d1e5..566b8c029cbcf 100644
--- a/Source/WebCore/platform/encryptedmedia/CDMPrivate.cpp
+++ b/Source/WebCore/platform/encryptedmedia/CDMPrivate.cpp
@@ -420,7 +420,7 @@ std::optional<Vector<CDMMediaCapability>> CDMPrivate::getSupportedCapabilitiesFo
         //       combination of container, media types, robustness and local accumulated configuration in combination
         //       with restrictions:
         MediaEngineSupportParameters parameters;
-        parameters.type = ContentType(contentType->mimeType());
+        parameters.type = ContentType(requestedCapability.contentType);
         if (MediaPlayer::supportsType(parameters) == MediaPlayer::SupportsType::IsNotSupported) {
 
             // Try with Media Source: