diff --git a/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/FourCornerZionStenoLexer.java b/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/FourCornerZionStenoLexer.java
index 6166e47..d413039 100644
--- a/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/FourCornerZionStenoLexer.java
+++ b/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/FourCornerZionStenoLexer.java
@@ -313,10 +313,10 @@ public class FourCornerZionStenoLexer {
 					lexer.smokeSignals.burnSandWormSignOutOfOrder(lexer.currLine, lexer.currCol);
 					return;
 				}
-				bitSize++;
 				bitIdxLast = bitIdx;
 				int bitOff = bitIdx - FourCornerDotCake.FC_SAND_OLGOI.getStart();
 				sandWalking[bitOff] = 1;
+				bitSize = bitOff;
 			}
 			lexer.sandwormHead.clear();
 			PrimitiveIterator.OfInt i = Arrays.stream(sandWalking).iterator();