diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 41824e776b6ca7b0a0339bbbbd5e9f19ed9e4406..295be1d07b8275d197c25c94e5d8954b61e07402 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -782,7 +782,7 @@ void mark_rodata_ro(void)
 	 * The rodata section (but not the kernel text!) should also be
 	 * not-executable.
 	 */
-	set_memory_nx(rodata_start, (end - start) >> PAGE_SHIFT);
+	set_memory_nx(rodata_start, (end - rodata_start) >> PAGE_SHIFT);
 
 	rodata_test();