diff --git a/lib/core.js b/lib/core.js
index 1e6406a2e6f..4e039f49231 100644
--- a/lib/core.js
+++ b/lib/core.js
@@ -2728,7 +2728,7 @@ type Pick<O: {...}, Keys: $Keys<O>> = {[key in Keys]: O[key]};
 /**
  * Omit specific fields from an object, e.g. Omit<O, 'foo' | 'bar'>
  */
-type Omit<O: {...}, Keys: $Keys<O>> = {[key in Exclude<$Keys<O>, Keys>]: O[key]};
+type Omit<O: {...}, Keys: $Keys<O>> = Pick<O, Exclude<$Keys<O>, Keys>>;
 
 /**
  * Construct an object type using string literals as keys with the given type,
diff --git a/tests/mapped_type_utilities/mapped_type_utilities.exp b/tests/mapped_type_utilities/mapped_type_utilities.exp
index 64c509b206c..d5cd1bebeb3 100644
--- a/tests/mapped_type_utilities/mapped_type_utilities.exp
+++ b/tests/mapped_type_utilities/mapped_type_utilities.exp
@@ -1,6 +1,6 @@
 Error ------------------------------------------------------------------------------------------------------ omit.js:7:7
 
-Cannot get `noFoo.foo` because property `foo` is missing in `Omit` [1]. [prop-missing]
+Cannot get `noFoo.foo` because property `foo` is missing in `Pick` [1]. [prop-missing]
 
    omit.js:7:7
    7| noFoo.foo; // ERROR
@@ -14,7 +14,7 @@ References:
 
 Error ---------------------------------------------------------------------------------------------------- omit.js:12:12
 
-Cannot get `noFooOrBar.foo` because property `foo` is missing in `Omit` [1]. [prop-missing]
+Cannot get `noFooOrBar.foo` because property `foo` is missing in `Pick` [1]. [prop-missing]
 
    omit.js:12:12
    12| noFooOrBar.foo; // ERROR
@@ -28,7 +28,7 @@ References:
 
 Error ---------------------------------------------------------------------------------------------------- omit.js:13:12
 
-Cannot get `noFooOrBar.bar` because property `bar` (did you mean `baz`?) is missing in `Omit` [1]. [prop-missing]
+Cannot get `noFooOrBar.bar` because property `bar` (did you mean `baz`?) is missing in `Pick` [1]. [prop-missing]
 
    omit.js:13:12
    13| noFooOrBar.bar; // ERROR
diff --git a/tests/mapped_type_utilities/omit.js b/tests/mapped_type_utilities/omit.js
index 25ad5940c7b..967328da5a0 100644
--- a/tests/mapped_type_utilities/omit.js
+++ b/tests/mapped_type_utilities/omit.js
@@ -13,3 +13,5 @@ noFooOrBar.foo; // ERROR
 noFooOrBar.bar; // ERROR
 noFooOrBar.baz; // OK
 (noFooOrBar:{baz: number}); // OK
+
+const o: Omit<{ foo?: string, bar: number; }, "bar"> = {}; // OK