diff --git a/kernel/resource.c b/kernel/resource.c
index 8f0e3d0..91f430f 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -287,7 +287,7 @@
 		pfn = (res.start + PAGE_SIZE - 1) >> PAGE_SHIFT;
 		end_pfn = (res.end + 1) >> PAGE_SHIFT;
 		if (end_pfn > pfn)
-		    ret = (*func)(pfn, end_pfn - pfn, arg);
+			ret = (*func)(pfn, end_pfn - pfn, arg);
 		if (ret)
 			break;
 		res.start = res.end + 1;