diff --git a/packages/compiler/src/injectable_compiler_2.ts b/packages/compiler/src/injectable_compiler_2.ts
index 083d2217f4..abe1d9c76c 100644
--- a/packages/compiler/src/injectable_compiler_2.ts
+++ b/packages/compiler/src/injectable_compiler_2.ts
@@ -52,7 +52,6 @@ export function compileInjectable(meta: R3InjectableMetadata): InjectableDef {
         fnOrClass,
         useNew,
         injectFn: Identifiers.inject,
-        useOptionalParam: true,
         deps: meta.deps,
       });
     } else if (meta.useClass !== undefined) {
@@ -94,7 +93,6 @@ export function compileInjectable(meta: R3InjectableMetadata): InjectableDef {
       fnOrClass: meta.type,
       useNew: true,
       injectFn: Identifiers.inject,
-      useOptionalParam: true,
       deps: meta.deps,
     });
   }
diff --git a/packages/compiler/src/render3/r3_factory.ts b/packages/compiler/src/render3/r3_factory.ts
index 78d7e3c75c..178434026d 100644
--- a/packages/compiler/src/render3/r3_factory.ts
+++ b/packages/compiler/src/render3/r3_factory.ts
@@ -55,19 +55,6 @@ export interface R3FactoryMetadata {
    */
   injectFn: o.ExternalReference;
 
-  /**
-   * Whether the `injectFn` given above accepts a 2nd parameter indicating the default value to
-   * be used to resolve missing @Optional dependencies.
-   *
-   * If the optional parameter is used, injectFn for an optional dependency will be invoked as:
-   * `injectFn(token, null, flags)`.
-   *
-   * If it's not used, injectFn for an optional dependency will be invoked as:
-   * `injectFn(token, flags)`. The Optional flag will indicate that injectFn should select a default
-   * value if it cannot satisfy the injection request for the token.
-   */
-  useOptionalParam: boolean;
-
   /**
    * If present, the return of the factory function will be an array with the injected value in the
    * 0th position and the extra results included in subsequent positions.
@@ -162,8 +149,7 @@ export interface R3DependencyMetadata {
  */
 export function compileFactoryFunction(meta: R3FactoryMetadata): o.Expression {
   // Each dependency becomes an invocation of an inject*() function.
-  const args =
-      meta.deps.map(dep => compileInjectDependency(dep, meta.injectFn, meta.useOptionalParam));
+  const args = meta.deps.map(dep => compileInjectDependency(dep, meta.injectFn));
 
   // The overall result depends on whether this is construction or function invocation.
   const expr = meta.useNew ? new o.InstantiateExpr(meta.fnOrClass, args) :
@@ -178,8 +164,7 @@ export function compileFactoryFunction(meta: R3FactoryMetadata): o.Expression {
 }
 
 function compileInjectDependency(
-    dep: R3DependencyMetadata, injectFn: o.ExternalReference,
-    useOptionalParam: boolean): o.Expression {
+    dep: R3DependencyMetadata, injectFn: o.ExternalReference): o.Expression {
   // Interpret the dependency according to its resolved type.
   switch (dep.resolved) {
     case R3ResolvedDependencyType.Token:
@@ -202,18 +187,7 @@ function compileInjectDependency(
       // parameters describing how to inject the dependency must be passed to the inject function
       // that's being used.
       if (flags !== InjectFlags.Default || dep.optional) {
-        // Either the dependency is optional, or non-default flags are in use. Either of these cases
-        // necessitates adding an argument for the default value if such an argument is required
-        // by the inject function (useOptionalParam === true).
-        if (useOptionalParam) {
-          // The inject function requires a default value parameter.
-          injectArgs.push(dep.optional ? o.NULL_EXPR : o.literal(undefined));
-        }
-        // The last parameter is always the InjectFlags, which only need to be specified if they're
-        // non-default.
-        if (flags !== InjectFlags.Default) {
-          injectArgs.push(o.literal(flags));
-        }
+        injectArgs.push(o.literal(flags));
       }
       return o.importExpr(injectFn).callFn(injectArgs);
     }
diff --git a/packages/compiler/src/render3/r3_pipe_compiler.ts b/packages/compiler/src/render3/r3_pipe_compiler.ts
index 98c75db184..a7456b4e7a 100644
--- a/packages/compiler/src/render3/r3_pipe_compiler.ts
+++ b/packages/compiler/src/render3/r3_pipe_compiler.ts
@@ -37,7 +37,6 @@ export function compilePipe(
     fnOrClass: outputCtx.importExpr(pipe.type.reference), deps,
     useNew: true,
     injectFn: R3.directiveInject,
-    useOptionalParam: false,
   });
   definitionMapValues.push({key: 'factory', value: templateFactory, quoted: false});
 
diff --git a/packages/compiler/src/render3/view/compiler.ts b/packages/compiler/src/render3/view/compiler.ts
index b6b8f76ae9..63a2462408 100644
--- a/packages/compiler/src/render3/view/compiler.ts
+++ b/packages/compiler/src/render3/view/compiler.ts
@@ -49,7 +49,6 @@ function baseDirectiveFields(
                       deps: meta.deps,
                       useNew: true,
                       injectFn: R3.directiveInject,
-                      useOptionalParam: false,
                       extraResults: queryDefinitions,
                     }));