diff --git a/hgeometry.cabal b/hgeometry.cabal
--- a/hgeometry.cabal
+++ b/hgeometry.cabal
@@ -11,7 +11,7 @@
 --                   | | +----- non-breaking API additions
 --                   | | | +--- code changes with no API change
 
-version:             0.1.1.0
+version:             0.1.1.1
 
 -- A short (one-line) description of the package.
 synopsis:            Geometry types in Haskell
diff --git a/src/Data/Geometry/Geometry.hs b/src/Data/Geometry/Geometry.hs
--- a/src/Data/Geometry/Geometry.hs
+++ b/src/Data/Geometry/Geometry.hs
@@ -93,7 +93,7 @@
                          , Vec3 (g,h,i)))) (Vec3 (x,y,z)) =
     Vec3 ( a*x + b*y + c*z,
            d*x + e*y + f*z,
-           g*z + h*y + i*z)
+           g*x + h*y + i*z)