diff --git a/src/constants.a b/src/constants.a
index 37233c2f3..55b39980f 100644
--- a/src/constants.a
+++ b/src/constants.a
@@ -149,6 +149,7 @@ iCurBlockLo    = $D401
 iCurBlockHi    = $D403
 iProDOS_enter  = $D678
 LoadFileDirect = $DB01
+iAuxReq        = $DB27
 launchpatch    = $D616
 iAddToPath     = $FEC3
 itraverse      = $D8E0
diff --git a/src/glue.prorwts2.lc2.a b/src/glue.prorwts2.lc2.a
index 4ab01bddb..c68bfcc3b 100644
--- a/src/glue.prorwts2.lc2.a
+++ b/src/glue.prorwts2.lc2.a
@@ -35,6 +35,14 @@ LoadFileAuxInternal
          +ST16 ldrlo
 +        lda   #$FF                  ; read entire file (ProRWTS2 will figure out exact size)
          sta   sizehi
+!if RELBASE != $2000 {
+  !ifdef PASS2 {
+  } else { ;PASS2
+    !if *+1 != iAuxReq {
+      !error "iAuxReq=",*+1, ", fix constants.a"
+    }
+  }
+}
 @auxreq
          lda   #0
          sta   auxreq
diff --git a/src/macros.a b/src/macros.a
index f7cb53f9a..6c5a8dd09 100755
--- a/src/macros.a
+++ b/src/macros.a
@@ -372,6 +372,8 @@
 ; LC RAM 2 MUST BE BANKED IN
 ; LOW BYTE OF .addr MUST BE $00
 !macro   LOAD_FILE_AT .filepath, .addr {
+         lda   #0
+         sta   iAuxReq    ; read to main memory
          lda   #>.addr
          sta   ldrhi
          lda   iCurBlockLo