diff --git a/asm/assemble.c b/asm/assemble.c
index 593045bf3..cd3f46936 100644
--- a/asm/assemble.c
+++ b/asm/assemble.c
@@ -1111,7 +1111,7 @@ static int64_t len_extops(const extop *e)
             break;
 
         case EOT_DB_RESERVE:
-            isize += e->dup;
+            isize += e->dup * e->elem;
             break;
         }