diff --git a/gst/compositor/compositororc.orc b/gst/compositor/compositororc.orc
index a9368b7343..234ec21128 100644
--- a/gst/compositor/compositororc.orc
+++ b/gst/compositor/compositororc.orc
@@ -17,7 +17,7 @@ copyl d1, s1
 .param 2 p1
 .temp 2 t1
 .temp 2 t2
-.const 1 c1 8 
+.const 1 c1 8
 
 convubw t1, d1
 convubw t2, s1
@@ -35,7 +35,6 @@ convsuswb d1, t2
 .source 4 s guint8
 .param 2 alpha
 .temp 4 t
-.temp 4 t2
 .temp 2 tw
 .temp 1 tb
 .temp 4 a
@@ -51,25 +50,14 @@ splatbl a, tb
 x4 convubw a_wide, a
 x4 mullw a_wide, a_wide, alpha
 x4 div255w a_wide, a_wide
-
-# dest pixel into t2
-loadl t2, d
-
-# t = s - d (as bytes)
-x4 subb t, t, t2
-
-# s_wide = (uint16)(t) * alpha
 x4 convubw s_wide, t
+loadl t, d
+x4 convubw d_wide, t
+x4 subw s_wide, s_wide, d_wide
 x4 mullw s_wide, s_wide, a_wide
 
-# s_wide /= 255
 x4 div255w s_wide, s_wide
-
-# d_wide = (uint16)(dest) + s_wide
-x4 convubw d_wide, t2
 x4 addw d_wide, d_wide, s_wide
-
-# Set output alpha to 0xff and store
 x4 convwb t, d_wide
 orl t, t, a_alpha
 storel d, t
@@ -98,15 +86,13 @@ x4 convubw a_wide, a
 x4 mullw a_wide, a_wide, alpha
 x4 div255w a_wide, a_wide
 
-loadl t2, d
-# t = s - d (as bytes)
-x4 subb t, t, t2
-
 x4 convubw s_wide, t
+loadl t, d
+x4 convubw d_wide, t
+x4 subw s_wide, s_wide, d_wide
 x4 mullw s_wide, s_wide, a_wide
 x4 div255w s_wide, s_wide
 
-x4 convubw d_wide, t2
 x4 addw d_wide, d_wide, s_wide
 x4 convwb t, d_wide
 orl t, t, a_alpha