diff --git a/bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/library/os.c b/bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/library/os.c
index b29812ac75..d4730bd444 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/library/os.c	
+++ b/bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/library/os.c	
@@ -7645,7 +7645,7 @@ JNIEXPORT jlong JNICALL OS_NATIVE(sel_1registerName)
 	jlong rc = 0;
 	OS_NATIVE_ENTER(env, that, sel_1registerName_FUNC);
 	if (arg0) if ((lparg0 = (*env)->GetStringUTFChars(env, arg0, NULL)) == NULL) goto fail;
-	rc = (jlong)sel_registerName(lparg0);
+	rc = (jlong)((jlong (*)(const char*))sel_registerName)((const char*)lparg0);
 fail:
 	if (arg0 && lparg0) (*env)->ReleaseStringUTFChars(env, arg0, lparg0);
 	OS_NATIVE_EXIT(env, that, sel_1registerName_FUNC);
diff --git a/bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/org/eclipse/swt/internal/cocoa/OS.java b/bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/org/eclipse/swt/internal/cocoa/OS.java
index fffa4837ed..9cdaaf233e 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/org/eclipse/swt/internal/cocoa/OS.java	
+++ b/bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/org/eclipse/swt/internal/cocoa/OS.java	
@@ -562,6 +562,10 @@ public static boolean isBigSurOrLater () {
  * @param clazz cast=(Class)
  */
 public static final native long object_setClass(long obj, long clazz);
+/**
+ * @method flags=cast
+ * @param selectorName cast=(const char*)
+ */
 public static final native long sel_registerName(String selectorName);
 public static final native int objc_super_sizeof();