diff --git a/sys/arm/include/vm.h b/sys/arm/include/vm.h
--- a/sys/arm/include/vm.h
+++ b/sys/arm/include/vm.h
@@ -36,7 +36,7 @@
 #define VM_MEMATTR_WRITE_THROUGH	((vm_memattr_t)4)
 
 #define VM_MEMATTR_DEFAULT		VM_MEMATTR_WB_WA
-#define VM_MEMATTR_UNCACHEABLE		VM_MEMATTR_SO 	/* misused by DMA */
+#define VM_MEMATTR_UNCACHEABLE		VM_MEMATTR_NOCACHE	/* used by BUSDMA */
 #ifdef _KERNEL
 /* Don't export aliased VM_MEMATTR to userland */
 #define VM_MEMATTR_WRITE_COMBINING 	VM_MEMATTR_WRITE_THROUGH /* for DRM */