diff --git a/sys/arm64/arm64/copyinout.S b/sys/arm64/arm64/copyinout.S
index 005fa61bfe8..23f56ae85da 100644
--- a/sys/arm64/arm64/copyinout.S
+++ b/sys/arm64/arm64/copyinout.S
@@ -30,6 +30,7 @@
 #include <machine/asm.h>
 #include <sys/errno.h>
 
+#include <machine/param.h>
 #include <machine/vmparam.h>
 
 #include "assym.inc"
diff --git a/sys/arm64/include/vmparam.h b/sys/arm64/include/vmparam.h
index 0967d3c0aed..d5d4a5691f3 100644
--- a/sys/arm64/include/vmparam.h
+++ b/sys/arm64/include/vmparam.h
@@ -99,8 +99,17 @@
  * are used by UMA, the physical memory allocator reduces the likelihood of
  * both 2MB page TLB misses and cache misses during the page table walk when
  * a 2MB page TLB miss does occur.
+ *
+ * When PAGE_SIZE is 16KB, an allocation size of 32MB is supported.  This
+ * size is used by level 0 reservations and L2 BLOCK mappings.
  */
+#if PAGE_SIZE == PAGE_SIZE_4K
 #define	VM_NFREEORDER		13
+#elif PAGE_SIZE == PAGE_SIZE_16K
+#define	VM_NFREEORDER		12
+#else
+#error Unsupported page size
+#endif
 
 /*
  * Enable superpage reservations: 1 level.
@@ -110,10 +119,17 @@
 #endif
 
 /*
- * Level 0 reservations consist of 512 pages.
+ * Level 0 reservations consist of 512 pages when PAGE_SIZE is 4KB, and
+ * 2048 pages when PAGE_SIZE is 16KB.
  */
 #ifndef	VM_LEVEL_0_ORDER
+#if PAGE_SIZE == PAGE_SIZE_4K
 #define	VM_LEVEL_0_ORDER	9
+#elif PAGE_SIZE == PAGE_SIZE_16K
+#define	VM_LEVEL_0_ORDER	11
+#else
+#error Unsupported page size
+#endif
 #endif
 
 /**