diff --git a/config/kernel-dentry-alias.m4 b/config/kernel-dentry-alias.m4
deleted file mode 100644
index f0ddb8d01..000000000
--- a/config/kernel-dentry-alias.m4
+++ /dev/null
@@ -1,30 +0,0 @@
-dnl #
-dnl # 3.18 API change
-dnl # Dentry aliases are in d_u struct dentry member
-dnl #
-AC_DEFUN([ZFS_AC_KERNEL_SRC_DENTRY_ALIAS_D_U], [
-	ZFS_LINUX_TEST_SRC([dentry_alias_d_u], [
-		#include <linux/fs.h>
-		#include <linux/dcache.h>
-		#include <linux/list.h>
-	], [
-		struct inode *inode __attribute__ ((unused)) = NULL;
-		struct dentry *dentry __attribute__ ((unused)) = NULL;
-		hlist_for_each_entry(dentry, &inode->i_dentry,
-		    d_u.d_alias) {
-			d_drop(dentry);
-		}
-	])
-])
-
-AC_DEFUN([ZFS_AC_KERNEL_DENTRY_ALIAS_D_U], [
-	AC_MSG_CHECKING([whether dentry aliases are in d_u member])
-	ZFS_LINUX_TEST_RESULT([dentry_alias_d_u], [
-		AC_MSG_RESULT(yes)
-		AC_DEFINE(HAVE_DENTRY_D_U_ALIASES, 1,
-		    [dentry aliases are in d_u member])
-	],[
-		AC_MSG_RESULT(no)
-	])
-])
-
diff --git a/config/kernel.m4 b/config/kernel.m4
index e64f3bd69..f9dab8fbe 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -94,7 +94,6 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
 	ZFS_AC_KERNEL_SRC_SETATTR_PREPARE
 	ZFS_AC_KERNEL_SRC_INSERT_INODE_LOCKED
 	ZFS_AC_KERNEL_SRC_DENTRY
-	ZFS_AC_KERNEL_SRC_DENTRY_ALIAS_D_U
 	ZFS_AC_KERNEL_SRC_TRUNCATE_SETSIZE
 	ZFS_AC_KERNEL_SRC_SECURITY_INODE
 	ZFS_AC_KERNEL_SRC_FST_MOUNT
@@ -244,7 +243,6 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
 	ZFS_AC_KERNEL_SETATTR_PREPARE
 	ZFS_AC_KERNEL_INSERT_INODE_LOCKED
 	ZFS_AC_KERNEL_DENTRY
-	ZFS_AC_KERNEL_DENTRY_ALIAS_D_U
 	ZFS_AC_KERNEL_TRUNCATE_SETSIZE
 	ZFS_AC_KERNEL_SECURITY_INODE
 	ZFS_AC_KERNEL_FST_MOUNT
diff --git a/include/os/linux/kernel/linux/dcache_compat.h b/include/os/linux/kernel/linux/dcache_compat.h
index ab1711b99..4d92e4dbd 100644
--- a/include/os/linux/kernel/linux/dcache_compat.h
+++ b/include/os/linux/kernel/linux/dcache_compat.h
@@ -35,9 +35,7 @@
 #define	d_make_root(inode)	d_alloc_root(inode)
 #endif /* HAVE_D_MAKE_ROOT */
 
-#ifdef HAVE_DENTRY_D_U_ALIASES
 #define	d_alias			d_u.d_alias
-#endif
 
 /*
  * Starting from Linux 5.13, flush_dcache_page() becomes an inline function