diff --git a/js/src/frontend/Parser.cpp b/js/src/frontend/Parser.cpp
index 7c8df7d498..a088949c8b 100644
--- a/js/src/frontend/Parser.cpp
+++ b/js/src/frontend/Parser.cpp
@@ -7491,11 +7491,6 @@ Parser<ParseHandler>::classMember(YieldHandling yieldHandling,
         return false;
 
     if (propType == PropertyType::Field) {
-        if (!options().fieldsEnabledOption) {
-            errorAt(propNameOffset, JSMSG_FIELDS_NOT_SUPPORTED);
-            return false;
-        }
-
         if (isStatic) {
             if (propAtom == context->names().prototype) {
                 errorAt(propNameOffset, JSMSG_BAD_METHOD_DEF);
diff --git a/js/src/frontend/TokenStream.cpp b/js/src/frontend/TokenStream.cpp
index 2c3371b465..f11fdcd793 100644
--- a/js/src/frontend/TokenStream.cpp
+++ b/js/src/frontend/TokenStream.cpp
@@ -1545,11 +1545,6 @@ TokenStream::getTokenInternal(TokenKind* ttp, Modifier modifier)
         if (identVisibility == NameVisibility::Private) {
             MOZ_ASSERT(identStart[0] == '#', "Private identifier starts with #");
             tp->type = TOK_PRIVATE_NAME;
-
-            if (!options().fieldsEnabledOption) {
-                reportError(JSMSG_FIELDS_NOT_SUPPORTED);
-                goto error;
-            }
         } else {
             tp->type = TOK_NAME;
         }
diff --git a/js/src/jsapi.cpp b/js/src/jsapi.cpp
index 6b2a719d7e..c0fa85bc68 100644
--- a/js/src/jsapi.cpp
+++ b/js/src/jsapi.cpp
@@ -3873,7 +3873,6 @@ JS::TransitiveCompileOptions::copyPODTransitiveOptions(const TransitiveCompileOp
     forceAsync = rhs.forceAsync;
     installedFile = rhs.installedFile;
     sourceIsLazy = rhs.sourceIsLazy;
-    fieldsEnabledOption = rhs.fieldsEnabledOption;
     introductionType = rhs.introductionType;
     introductionLineno = rhs.introductionLineno;
     introductionOffset = rhs.introductionOffset;
diff --git a/js/src/jsapi.h b/js/src/jsapi.h
index 4640ab0b50..a6a5429cf5 100644
--- a/js/src/jsapi.h
+++ b/js/src/jsapi.h
@@ -3820,7 +3820,6 @@ class JS_FRIEND_API(TransitiveCompileOptions)
         forceAsync(false),
         installedFile(false),
         sourceIsLazy(false),
-        fieldsEnabledOption(true),
         introductionType(nullptr),
         introductionLineno(0),
         introductionOffset(0),
@@ -3856,7 +3855,6 @@ class JS_FRIEND_API(TransitiveCompileOptions)
     bool forceAsync;
     bool installedFile;  // 'true' iff pre-compiling js file in packaged app
     bool sourceIsLazy;
-    bool fieldsEnabledOption;
 
     // |introductionType| is a statically allocated C string:
     // one of "eval", "Function", or "GeneratorFunction".