diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index 2d052363e..ca9039a56 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -19,6 +19,7 @@ Picocli follows [semantic versioning](http://semver.org/).
 
 
 ## <a name="4.6.2-fixes"></a> Fixed issues
+* [#1303] Bugfix: Prevent `IllegalArgumentException: argument type mismatch` error in method subcommands with inherited mixed-in standard help options. Thanks to [Andreas Deininger](https://github.com/deining) for raising this.
 * [#1300] Bugfix: Avoid spurious warning "Could not set initial value for field boolean" when reusing `CommandLine` with ArgGroup. Thanks to [Yashodhan Ghadge](https://github.com/codexetreme) for raising this.
 * [#1296] DOC: add Kotlin code samples to user manual; other user manual improvements. Thanks to [Andreas Deininger](https://github.com/deining) for the pull request.
 * [#1299] DOC: Link to `IParameterPreprocessor` from `IParameterConsumer` javadoc. Thanks to [Andreas Deininger](https://github.com/deining) for the pull request.
diff --git a/src/main/java/picocli/CommandLine.java b/src/main/java/picocli/CommandLine.java
index 319d8b565..2590464e8 100644
--- a/src/main/java/picocli/CommandLine.java
+++ b/src/main/java/picocli/CommandLine.java
@@ -6937,7 +6937,8 @@ public Set<String> names() {
             public List<ArgSpec> args() { return Collections.unmodifiableList(args); }
             Object[] commandMethodParamValues() {
                 Object[] values = new Object[methodParams.length];
-                int argIndex = mixins.containsKey(AutoHelpMixin.KEY) ? 2 : 0;
+                CommandSpec autoHelpMixin = mixins.get(AutoHelpMixin.KEY);
+                int argIndex = autoHelpMixin == null || autoHelpMixin.inherited() ? 0 : 2;
                 for (int i = 0; i < methodParams.length; i++) {
                     if (methodParams[i].isAnnotationPresent(Mixin.class)) {
                         String name = methodParams[i].getAnnotation(Mixin.class).name();
@@ -7156,6 +7157,7 @@ public CommandSpec negatableOptionTransformer(INegatableOptionTransformer newVal
             public CommandSpec mixinStandardHelpOptions(boolean newValue) {
                 if (newValue) {
                     CommandSpec mixin = CommandSpec.forAnnotatedObject(new AutoHelpMixin(), new DefaultFactory());
+                    mixin.inherited = this.inherited();
                     addMixin(AutoHelpMixin.KEY, mixin);
                 } else {
                     CommandSpec helpMixin = mixins.remove(AutoHelpMixin.KEY);
diff --git a/src/test/java/picocli/InheritedOptionTest.java b/src/test/java/picocli/InheritedOptionTest.java
index 78fa153b4..72378ce0c 100644
--- a/src/test/java/picocli/InheritedOptionTest.java
+++ b/src/test/java/picocli/InheritedOptionTest.java
@@ -525,4 +525,22 @@ public void testIssue1159ParseResult() {
         assertFalse("Not matched on the parent command",
                 parseResult.hasMatchedOption("--xxx-yyy"));
     }
+
+
+    @Test
+    public void testIssue1303InheritCommandWithMethodSubcommands() {
+        @Command(scope = INHERIT, mixinStandardHelpOptions = true)
+        class InheritApp  {
+            int subCalled;
+
+            @Command()
+            void sub(@Option(names = "-foo") int foo) {
+                subCalled = foo;
+                //System.out.printf("Foo: %d", foo);
+            }
+        }
+        InheritApp app = new InheritApp();
+        new CommandLine(app).execute("sub", "-foo", "42" );
+        assertEquals(42, app.subCalled);
+    }
 }