diff --git a/dom/cache/DBSchema.cpp b/dom/cache/DBSchema.cpp
index 03da25a3844..6acf83e19dc 100644
--- a/dom/cache/DBSchema.cpp
+++ b/dom/cache/DBSchema.cpp
@@ -339,7 +339,7 @@ DBSchema::CachePut(mozIStorageConnection* aConn, CacheId aCacheId,
   MOZ_ASSERT(!NS_IsMainThread());
   MOZ_ASSERT(aConn);
 
-  PCacheQueryParams params(false, false, false, false, false,
+  PCacheQueryParams params(false, false, false, false,
                            NS_LITERAL_STRING(""));
   nsAutoTArray<EntryId, 256> matches;
   nsresult rv = QueryCache(aConn, aCacheId, aRequest, params, matches);
@@ -675,13 +675,7 @@ DBSchema::QueryCache(mozIStorageConnection* aConn, CacheId aCacheId,
     query.AppendLiteral("request_url");
   }
 
-  if (aParams.prefixMatch()) {
-    query.AppendLiteral(" LIKE ?2 ESCAPE '\\'");
-  } else {
-    query.AppendLiteral("=?2");
-  }
-
-  query.AppendLiteral(" GROUP BY entries.id ORDER BY entries.id;");
+  query.AppendLiteral("=?2 GROUP BY entries.id ORDER BY entries.id;");
 
   nsCOMPtr<mozIStorageStatement> state;
   nsresult rv = aConn->CreateStatement(query, getter_AddRefs(state));
@@ -690,14 +684,6 @@ DBSchema::QueryCache(mozIStorageConnection* aConn, CacheId aCacheId,
   rv = state->BindInt32Parameter(0, aCacheId);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
-  if (aParams.prefixMatch()) {
-    nsAutoString escapedUrlToMatch;
-    rv = state->EscapeStringForLIKE(urlToMatch, '\\', escapedUrlToMatch);
-    if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
-    urlToMatch = escapedUrlToMatch;
-    urlToMatch.AppendLiteral("%");
-  }
-
   rv = state->BindStringParameter(1, urlToMatch);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
diff --git a/dom/cache/PCacheTypes.ipdlh b/dom/cache/PCacheTypes.ipdlh
index 03a6b6e6330..d56ca86e647 100644
--- a/dom/cache/PCacheTypes.ipdlh
+++ b/dom/cache/PCacheTypes.ipdlh
@@ -22,7 +22,6 @@ struct PCacheQueryParams
   bool ignoreSearch;
   bool ignoreMethod;
   bool ignoreVary;
-  bool prefixMatch;
   bool cacheNameSet;
   nsString cacheName;
 };
diff --git a/dom/cache/TypeUtils.cpp b/dom/cache/TypeUtils.cpp
index ff8d9ad34b6..05e6e5a0ec7 100644
--- a/dom/cache/TypeUtils.cpp
+++ b/dom/cache/TypeUtils.cpp
@@ -266,7 +266,6 @@ TypeUtils::ToPCacheQueryParams(PCacheQueryParams& aOut,
   aOut.ignoreSearch() = aIn.mIgnoreSearch;
   aOut.ignoreMethod() = aIn.mIgnoreMethod;
   aOut.ignoreVary() = aIn.mIgnoreVary;
-  aOut.prefixMatch() = aIn.mPrefixMatch;
   aOut.cacheNameSet() = aIn.mCacheName.WasPassed();
   if (aOut.cacheNameSet()) {
     aOut.cacheName() = aIn.mCacheName.Value();
diff --git a/dom/webidl/Cache.webidl b/dom/webidl/Cache.webidl
index 099701d2bdc..7df69a8f6e0 100644
--- a/dom/webidl/Cache.webidl
+++ b/dom/webidl/Cache.webidl
@@ -33,7 +33,6 @@ dictionary CacheQueryOptions {
 boolean ignoreSearch = false;
 boolean ignoreMethod = false;
 boolean ignoreVary = false;
-boolean prefixMatch = false;
 DOMString cacheName;
 };