diff --git a/lib/hdr-load.js b/lib/hdr-load.js
index 658c4e0..5f04ef0 100644
--- a/lib/hdr-load.js
+++ b/lib/hdr-load.js
@@ -177,7 +177,7 @@ HDRLoader.prototype._readOldRLE = function (chunk) {
 				scanline[writePos] = [];
 				scanline[writePos][X] = scanline[writePos - 1][X];
 				scanline[writePos][Y] = scanline[writePos - 1][Y];
-				scanline[writePos][X] = scanline[writePos - 1][Z];
+				scanline[writePos][Z] = scanline[writePos - 1][Z];
 				scanline[writePos][E] = scanline[writePos - 1][E];
 				writePos++;
 				len--;