diff --git a/fles/mcbm2018/unpacker/CbmMcbm2018UnpackerAlgoTof.cxx b/fles/mcbm2018/unpacker/CbmMcbm2018UnpackerAlgoTof.cxx
index 44e90571c47097515f2bd10ca3fab2fc41d2a650..19c2de577fab9a65f1388c150c69a635580236b8 100644
--- a/fles/mcbm2018/unpacker/CbmMcbm2018UnpackerAlgoTof.cxx
+++ b/fles/mcbm2018/unpacker/CbmMcbm2018UnpackerAlgoTof.cxx
@@ -381,7 +381,9 @@ Bool_t CbmMcbm2018UnpackerAlgoTof::InitParameters() {
             if (iSideMap == 0) iStrMap = 31 - iStr;
             switch (fviRpcSide[iGbtx]) {
               case 0:; break;
-              case 1:; break;
+              case 1:;
+                iRpcMap = 1 - iRpcMap; // swap counters
+              	break;
               case 2:
                 switch (iFeet) {
                   case 1: