diff --git a/src/libsrc/apple/grlib.pla b/src/libsrc/apple/grlib.pla
index a534e3c..ae931d9 100644
--- a/src/libsrc/apple/grlib.pla
+++ b/src/libsrc/apple/grlib.pla
@@ -213,9 +213,9 @@ export asm grBLT(x, y, width, height, src)#0
         LDA     (SRC),Y
         BMI     ++
         LDY     TMP
-        EOR     (GBASE),Y
         BCS     oddBLT
         ; EVEN ROW
+        EOR     (GBASE),Y
         AND     #$0F
         BCC     evnBLT
        ; ODD ROW
@@ -223,6 +223,7 @@ oddBLT  ASL
         ASL
         ASL
         ASL
+        EOR     (GBASE),Y
         AND     #$F0
 evnBLT  EOR     (GBASE),Y
         STA     (GBASE),Y