diff --git a/cmake/thisREST.cmake b/cmake/thisREST.cmake
index a51c4257d..3613b0e1d 100644
--- a/cmake/thisREST.cmake
+++ b/cmake/thisREST.cmake
@@ -1,5 +1,17 @@
 # Write thisREST.[c]sh to INSTALL directory
 
+##### Checking if we are using CVMFS LCG GCC11 environment
+set(lcg_found FALSE)
+
+# Check if the CMAKE_COMMAND contains both "cvmfs", "lcg" and "x86_64-el9-gcc11"
+string(FIND "${CMAKE_COMMAND}" "cvmfs" cvmfs_pos)
+string(FIND "${CMAKE_COMMAND}" "lcg" lcg_pos)
+string(FIND "${CMAKE_COMMAND}" "x86_64-el9-gcc11" gcc_pos)
+
+if (lcg_pos GREATER -1 AND cvmfs_pos GREATER -1 AND gcc_pos GREATER -1)
+    set(lcg_found TRUE)
+endif()
+
 # We identify the thisroot.sh script for the corresponding ROOT version
 execute_process(
     COMMAND root-config --prefix
@@ -28,8 +40,8 @@ if (${REST_G4} MATCHES "ON")
 endif ()
 
 set(loadLCG "")
-if( ${REST_LCG} MATCHES "ON" )
-    set(loadG4
+if( lcg_found )
+	set(loadLCG
 		"\# REST_LCG was enabled. We load LCG_104 environment.\nsource /cvmfs/sft.cern.ch/lcg/views/LCG_104/x86_64-el9-gcc11-opt/setup.sh\n\n")
 endif()