diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 0e62235fd03c8..7890c2563685d 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -13816,7 +13816,7 @@ namespace ts {
          * @param source
          * @param target
          */
-        function isCoercibleUnderDoublEquals(source: Type, target: Type): boolean {
+        function isCoercibleUnderDoubleEquals(source: Type, target: Type): boolean {
             return ((source.flags & (TypeFlags.Number | TypeFlags.String | TypeFlags.BooleanLiteral)) !== 0)
                 && ((target.flags & (TypeFlags.Number | TypeFlags.String | TypeFlags.Boolean)) !== 0);
         }
@@ -16128,7 +16128,7 @@ namespace ts {
                 }
                 if (assumeTrue) {
                     const filterFn: (t: Type) => boolean = operator === SyntaxKind.EqualsEqualsToken ?
-                        (t => areTypesComparable(t, valueType) || isCoercibleUnderDoublEquals(t, valueType)) :
+                        (t => areTypesComparable(t, valueType) || isCoercibleUnderDoubleEquals(t, valueType)) :
                         t => areTypesComparable(t, valueType);
                     const narrowedType = filterType(type, filterFn);
                     return narrowedType.flags & TypeFlags.Never ? type : replacePrimitivesWithLiterals(narrowedType, valueType);