diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 903addec182..110332b6224 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -11759,10 +11759,6 @@ namespace ts {
             checkSignatureDeclaration(node);
             let isAsync = isAsyncFunctionLike(node);
             if (isAsync) {
-                if (!compilerOptions.experimentalAsyncFunctions) {
-                    error(node, Diagnostics.Experimental_support_for_async_functions_is_a_feature_that_is_subject_to_change_in_a_future_release_Specify_experimentalAsyncFunctions_to_remove_this_warning);
-                }
-
                 emitAwaiter = true;
             }
 
diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index 731a37a8cb7..9a8c0ac416f 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -222,11 +222,6 @@ namespace ts {
             type: "boolean",
             description: Diagnostics.Watch_input_files,
         },
-        {
-            name: "experimentalAsyncFunctions",
-            type: "boolean",
-            description: Diagnostics.Enables_experimental_support_for_ES7_async_functions
-        },
         {
             name: "experimentalDecorators",
             type: "boolean",
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index b391545a733..fda876fa36b 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -783,10 +783,6 @@
         "category": "Error",
         "code": 1245
     },
-    "Experimental support for async functions is a feature that is subject to change in a future release. Specify '--experimentalAsyncFunctions' to remove this warning.": {
-        "category": "Error",
-        "code": 1246
-    },
 
     "'with' statements are not allowed in an async function block.": {
         "category": "Error",
@@ -2282,10 +2278,6 @@
         "category": "Message",
         "code": 6066
     },
-    "Option 'experimentalAsyncFunctions' cannot be specified when targeting ES5 or lower.": {
-        "category": "Message",
-        "code": 6067
-    },
     "Enables experimental support for ES7 async functions.": {
         "category": "Message",
         "code": 6068
diff --git a/src/compiler/program.ts b/src/compiler/program.ts
index c6d3a245a8d..abef5088fbb 100644
--- a/src/compiler/program.ts
+++ b/src/compiler/program.ts
@@ -1076,11 +1076,6 @@ namespace ts {
                 !options.experimentalDecorators) {
                 programDiagnostics.add(createCompilerDiagnostic(Diagnostics.Option_0_cannot_be_specified_without_specifying_option_1, "emitDecoratorMetadata", "experimentalDecorators"));
             }
-
-            if (options.experimentalAsyncFunctions &&
-                options.target !== ScriptTarget.ES6) {
-                programDiagnostics.add(createCompilerDiagnostic(Diagnostics.Option_experimentalAsyncFunctions_cannot_be_specified_when_targeting_ES5_or_lower));
-            }
         }
     }
 }
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index cbaa3e65e27..2de545ce32f 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -2080,7 +2080,6 @@ namespace ts {
         watch?: boolean;
         isolatedModules?: boolean;
         experimentalDecorators?: boolean;
-        experimentalAsyncFunctions?: boolean;
         emitDecoratorMetadata?: boolean;
         moduleResolution?: ModuleResolutionKind;
         /* @internal */ stripInternal?: boolean;