diff --git a/lang/m2/libm2/par_misc.e b/lang/m2/libm2/par_misc.e
index b7a1898d0..0e97d4478 100644
--- a/lang/m2/libm2/par_misc.e
+++ b/lang/m2/libm2/par_misc.e
@@ -138,7 +138,7 @@ sv
  lxl 0
 2
  dup EM_PSIZE
- adb -3*EM_PSIZE
+ adp -3*EM_PSIZE
  lal 0
  loi EM_PSIZE		; compare target SP with current LB to see if we must
  loi EM_PSIZE