diff --git a/source/lib/compiler.ts b/source/lib/compiler.ts
index 02a9537..0535bcf 100644
--- a/source/lib/compiler.ts
+++ b/source/lib/compiler.ts
@@ -57,6 +57,7 @@ const expectErrorDiagnosticCodesToIgnore = new Set<DiagnosticCode>([
 	DiagnosticCode.RuntimeWillInvokeDecoratorWithXArgumentsButDecoratorExpectsAtLeastY,
 	DiagnosticCode.AcceptsTooFewArgumentsToBeUsedAsDecoratorHere,
 	DiagnosticCode.PropertyDoesNotExistOnTypeDidYouMean,
+	DiagnosticCode.ErrorIsOfTypeUnknown,
 ]);
 
 type IgnoreDiagnosticResult = 'preserve' | 'ignore' | Location;
diff --git a/source/lib/interfaces.ts b/source/lib/interfaces.ts
index 46b2207..0feb021 100644
--- a/source/lib/interfaces.ts
+++ b/source/lib/interfaces.ts
@@ -66,6 +66,7 @@ export enum DiagnosticCode {
 	MemberCannotHaveOverrideModifierBecauseItIsNotDeclaredInBaseClass = 4113,
 	MemberMustHaveOverrideModifier = 4114,
 	NewExpressionTargetLackingConstructSignatureHasAnyType = 7009,
+	ErrorIsOfTypeUnknown = 18046,
 }
 
 export interface Diagnostic {
diff --git a/source/test/fixtures/expect-error/values/index.test-d.ts b/source/test/fixtures/expect-error/values/index.test-d.ts
index 16a94c6..7b1f5b0 100644
--- a/source/test/fixtures/expect-error/values/index.test-d.ts
+++ b/source/test/fixtures/expect-error/values/index.test-d.ts
@@ -13,7 +13,9 @@ try {
 		expectError(foo.bar = 'quux');
 		expectError(foo.quux);
 	}
-} catch {}
+} catch (error) {
+	expectError(error.code);
+}
 
 expectError(hasProperty({name: 1}));
 
diff --git a/source/test/fixtures/expect-error/values/package.json b/source/test/fixtures/expect-error/values/package.json
index de6dc1d..52316ed 100644
--- a/source/test/fixtures/expect-error/values/package.json
+++ b/source/test/fixtures/expect-error/values/package.json
@@ -1,3 +1,8 @@
 {
-	"name": "foo"
+	"name": "foo",
+	"tsd": {
+		"compilerOptions": {
+			"useUnknownInCatchVariables": true
+		}
+	}
 }