diff --git a/util/opt/patterns b/util/opt/patterns
index 03db7f93c..fb4d4f620 100644
--- a/util/opt/patterns
+++ b/util/opt/patterns
@@ -1,10 +1,10 @@
 "$Header$"
 loc adi loc sbi $2==w && $4==w: loc $1-$3 adi w
 inc dec:
-inc loc adi $3==w:	loc $1+1 adi w
-inc loc sbi $3==w:	loc $1-1 sbi w
-dec loc adi $3==w:	loc $1-1 adi w
-dec loc sbi $3==w:	loc $1+1 sbi w
+inc loc adi $3==w:	loc $2+1 adi w
+inc loc sbi $3==w:	loc $2-1 sbi w
+dec loc adi $3==w:	loc $2-1 adi w
+dec loc sbi $3==w:	loc $2+1 sbi w
 ldc adi ldc sbi $2==2*w && $4==2*w:     ldc $1-$3 adi 2*w
 loc adi loc adi $2==w && $4==w: loc $1+$3 adi w
 ldc adi ldc adi $2==2*w && $4==2*w:     ldc $1+$3 adi 2*w