diff --git a/sys/arm64/include/vmparam.h b/sys/arm64/include/vmparam.h
--- a/sys/arm64/include/vmparam.h
+++ b/sys/arm64/include/vmparam.h
@@ -301,7 +301,6 @@
 extern vm_paddr_t dmap_phys_base;
 extern vm_paddr_t dmap_phys_max;
 extern vm_offset_t dmap_max_addr;
-extern vm_offset_t vm_max_kernel_address;
 
 #endif
 
diff --git a/sys/riscv/include/vmparam.h b/sys/riscv/include/vmparam.h
--- a/sys/riscv/include/vmparam.h
+++ b/sys/riscv/include/vmparam.h
@@ -240,7 +240,6 @@
 extern vm_paddr_t dmap_phys_base;
 extern vm_paddr_t dmap_phys_max;
 extern vm_offset_t dmap_max_addr;
-extern vm_offset_t vm_max_kernel_address;
 extern vm_offset_t init_pt_va;
 #endif