diff --git a/packages/compiler-cli/src/ngtsc/typecheck/src/type_constructor.ts b/packages/compiler-cli/src/ngtsc/typecheck/src/type_constructor.ts
index 139ec6a232..f80fd0fc69 100644
--- a/packages/compiler-cli/src/ngtsc/typecheck/src/type_constructor.ts
+++ b/packages/compiler-cli/src/ngtsc/typecheck/src/type_constructor.ts
@@ -166,8 +166,8 @@ function constructTypeCtorParameter(
   if (coercedKeys.length > 0) {
     const coercedLiteral = ts.createTypeLiteralNode(coercedKeys);
 
-    initType =
-        initType !== null ? ts.createUnionTypeNode([initType, coercedLiteral]) : coercedLiteral;
+    initType = initType !== null ? ts.createIntersectionTypeNode([initType, coercedLiteral]) :
+                                   coercedLiteral;
   }
 
   if (initType === null) {
diff --git a/packages/compiler-cli/src/ngtsc/typecheck/test/type_constructor_spec.ts b/packages/compiler-cli/src/ngtsc/typecheck/test/type_constructor_spec.ts
index 54c399f1ba..f490cda7f5 100644
--- a/packages/compiler-cli/src/ngtsc/typecheck/test/type_constructor_spec.ts
+++ b/packages/compiler-cli/src/ngtsc/typecheck/test/type_constructor_spec.ts
@@ -179,7 +179,7 @@ TestClass.ngTypeCtor({value: 'test'});
         const typeCtor = TestClassWithCtor.members.find(isTypeCtor)!;
         const ctorText = typeCtor.getText().replace(/[ \r\n]+/g, ' ');
         expect(ctorText).toContain(
-            'init: Pick<TestClass, "foo"> | { bar: typeof TestClass.ngAcceptInputType_bar; }');
+            'init: Pick<TestClass, "foo"> & { bar: typeof TestClass.ngAcceptInputType_bar; }');
       });
     });
   });
diff --git a/packages/compiler-cli/test/ngtsc/template_typecheck_spec.ts b/packages/compiler-cli/test/ngtsc/template_typecheck_spec.ts
index 377179e736..7c9ec4dbf4 100644
--- a/packages/compiler-cli/test/ngtsc/template_typecheck_spec.ts
+++ b/packages/compiler-cli/test/ngtsc/template_typecheck_spec.ts
@@ -1498,6 +1498,39 @@ export declare class AnimationEvent {
            expect(diags[0].messageText)
                .toBe(`Type 'boolean' is not assignable to type 'string | number'.`);
          });
+
+      it('should give an error for undefined bindings into regular inputs when coercion members are present',
+         () => {
+           env.tsconfig({strictTemplates: true});
+           env.write('test.ts', `
+            import {Component, Directive, NgModule, Input} from '@angular/core';
+
+            @Component({
+              selector: 'blah',
+              template: '<input dir [regular]="undefined" [coerced]="1">',
+            })
+            export class FooCmp {
+              invalidType = true;
+            }
+
+            @Directive({selector: '[dir]'})
+            export class CoercionDir {
+              @Input() regular: string;
+              @Input() coerced: boolean;
+
+              static ngAcceptInputType_coerced: boolean|number;
+            }
+
+            @NgModule({
+              declarations: [FooCmp, CoercionDir],
+            })
+            export class FooModule {}
+        `);
+           const diags = env.driveDiagnostics();
+           expect(diags.length).toBe(1);
+           expect(diags[0].messageText)
+               .toBe(`Type 'undefined' is not assignable to type 'string'.`);
+         });
     });
 
     describe('legacy schema checking with the DOM schema', () => {