diff --git a/ASTCEncoder/src/Decompressor.cpp b/ASTCEncoder/src/Decompressor.cpp
index 71e2279..dde3e8f 100644
--- a/ASTCEncoder/src/Decompressor.cpp
+++ b/ASTCEncoder/src/Decompressor.cpp
@@ -445,9 +445,9 @@ namespace ASTCC {
 
             case 4: {
               C = 13;
-              // B = dcb000dcb
+              // B = dcb0000dc
               uint32 dcb = (bitval >> 1) & 7;
-              B = (dcb << 6) | dcb;
+              B = (dcb << 6) | (dcb >> 1);
             }
             break;