diff --git a/libImaging/Unpack.c b/libImaging/Unpack.c
index 70b11b1b0..552c759b9 100644
--- a/libImaging/Unpack.c
+++ b/libImaging/Unpack.c
@@ -863,13 +863,6 @@ copy2(UINT8* out, const UINT8* in, int pixels)
     memcpy(out, in, pixels*2);
 }
 
-static void
-copy3(UINT8* out, const UINT8* in, int pixels)
-{
-    /* LAB triples, 24bit */
-    memcpy(out, in, 3 * pixels);
-}
-
 static void
 copy4(UINT8* out, const UINT8* in, int pixels)
 {