diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index c1e85fa09fe..0872ba3ef80 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -1999,7 +1999,7 @@ module ts {
                 }
 
                 if (typeReferences) {
-                    write(isImplementsList ? " implments " : " extends ");
+                    write(isImplementsList ? " implements " : " extends ");
                     emitCommaList(typeReferences, emitTypeOfTypeReference);
                 }
             }
diff --git a/tests/baselines/reference/commentsInheritance.js b/tests/baselines/reference/commentsInheritance.js
index 8003c8dc99b..edcd80ab347 100644
--- a/tests/baselines/reference/commentsInheritance.js
+++ b/tests/baselines/reference/commentsInheritance.js
@@ -272,7 +272,7 @@ interface i1 {
     nc_f1(): void;
     nc_l1: () => void;
 }
-declare class c1 implments i1 {
+declare class c1 implements i1 {
     i1_p1: number;
     i1_f1(): void;
     i1_l1: () => void;
diff --git a/tests/baselines/reference/declFileForClassWithMultipleBaseClasses.js b/tests/baselines/reference/declFileForClassWithMultipleBaseClasses.js
index 433f12bcd00..52d11836b11 100644
--- a/tests/baselines/reference/declFileForClassWithMultipleBaseClasses.js
+++ b/tests/baselines/reference/declFileForClassWithMultipleBaseClasses.js
@@ -70,7 +70,7 @@ interface I {
 interface J {
     bat(): any;
 }
-declare class D implments I, J {
+declare class D implements I, J {
     baz(): void;
     bat(): void;
     foo(): void;
diff --git a/tests/baselines/reference/declFileGenericClassWithGenericExtendedClass.js b/tests/baselines/reference/declFileGenericClassWithGenericExtendedClass.js
index 1f7848022af..dfeb6f5d3c3 100644
--- a/tests/baselines/reference/declFileGenericClassWithGenericExtendedClass.js
+++ b/tests/baselines/reference/declFileGenericClassWithGenericExtendedClass.js
@@ -49,6 +49,6 @@ declare class Derived<T> extends Base<T> {
 interface IBar<T> {
     derived: Derived<T>;
 }
-declare class Baz implments IBar<Baz> {
+declare class Baz implements IBar<Baz> {
     derived: Derived<Baz>;
 }
diff --git a/tests/baselines/reference/declFileGenericType2.js b/tests/baselines/reference/declFileGenericType2.js
index 94cdaa32eaa..1240e80e274 100644
--- a/tests/baselines/reference/declFileGenericType2.js
+++ b/tests/baselines/reference/declFileGenericType2.js
@@ -103,7 +103,7 @@ declare module templa.dom.mvc {
     }
 }
 declare module templa.dom.mvc {
-    class AbstractElementController<ModelType extends templa.mvc.IModel> extends templa.mvc.AbstractController<ModelType> implments IElementController<ModelType> {
+    class AbstractElementController<ModelType extends templa.mvc.IModel> extends templa.mvc.AbstractController<ModelType> implements IElementController<ModelType> {
         constructor();
     }
 }
diff --git a/tests/baselines/reference/declFileModuleContinuation.js b/tests/baselines/reference/declFileModuleContinuation.js
index 490d599a2d9..52925a387b1 100644
--- a/tests/baselines/reference/declFileModuleContinuation.js
+++ b/tests/baselines/reference/declFileModuleContinuation.js
@@ -33,6 +33,6 @@ declare module A.C {
     }
 }
 declare module A.B.C {
-    class W implments A.C.Z {
+    class W implements A.C.Z {
     }
 }
diff --git a/tests/baselines/reference/declFileWithInternalModuleNameConflictsInExtendsClause1.js b/tests/baselines/reference/declFileWithInternalModuleNameConflictsInExtendsClause1.js
index 98f3c1df276..dfd9f27f47d 100644
--- a/tests/baselines/reference/declFileWithInternalModuleNameConflictsInExtendsClause1.js
+++ b/tests/baselines/reference/declFileWithInternalModuleNameConflictsInExtendsClause1.js
@@ -38,6 +38,6 @@ declare module X.A.C {
     }
 }
 declare module X.A.B.C {
-    class W implments X.A.C.Z {
+    class W implements X.A.C.Z {
     }
 }
diff --git a/tests/baselines/reference/declFileWithInternalModuleNameConflictsInExtendsClause2.js b/tests/baselines/reference/declFileWithInternalModuleNameConflictsInExtendsClause2.js
index 6646ef907d1..06929c73cb7 100644
--- a/tests/baselines/reference/declFileWithInternalModuleNameConflictsInExtendsClause2.js
+++ b/tests/baselines/reference/declFileWithInternalModuleNameConflictsInExtendsClause2.js
@@ -41,7 +41,7 @@ declare module X.A.C {
     }
 }
 declare module X.A.B.C {
-    class W implments A.C.Z {
+    class W implements A.C.Z {
     }
 }
 declare module X.A.B.C {
diff --git a/tests/baselines/reference/declFileWithInternalModuleNameConflictsInExtendsClause3.js b/tests/baselines/reference/declFileWithInternalModuleNameConflictsInExtendsClause3.js
index ca74a916fa8..d6e6961c4ea 100644
--- a/tests/baselines/reference/declFileWithInternalModuleNameConflictsInExtendsClause3.js
+++ b/tests/baselines/reference/declFileWithInternalModuleNameConflictsInExtendsClause3.js
@@ -41,7 +41,7 @@ declare module X.A.C {
     }
 }
 declare module X.A.B.C {
-    class W implments X.A.C.Z {
+    class W implements X.A.C.Z {
     }
 }
 declare module X.A.B.C {
diff --git a/tests/baselines/reference/genericClassImplementingGenericInterfaceFromAnotherModule.js b/tests/baselines/reference/genericClassImplementingGenericInterfaceFromAnotherModule.js
index bbfc13f872b..7d26be5fb2e 100644
--- a/tests/baselines/reference/genericClassImplementingGenericInterfaceFromAnotherModule.js
+++ b/tests/baselines/reference/genericClassImplementingGenericInterfaceFromAnotherModule.js
@@ -25,6 +25,6 @@ declare module foo {
     }
 }
 declare module bar {
-    class Foo<T> implments foo.IFoo<T> {
+    class Foo<T> implements foo.IFoo<T> {
     }
 }
diff --git a/tests/baselines/reference/interfacedecl.js b/tests/baselines/reference/interfacedecl.js
index 84a9447ce64..fc1468b2c72 100644
--- a/tests/baselines/reference/interfacedecl.js
+++ b/tests/baselines/reference/interfacedecl.js
@@ -87,6 +87,6 @@ interface c extends a, b {
 }
 interface d extends a {
 }
-declare class c1 implments a {
+declare class c1 implements a {
 }
 declare var instance2: c1;