diff --git a/drivers/Spectrum-MI40xxSeries/CMakeLists.txt b/drivers/Spectrum-MI40xxSeries/CMakeLists.txt
index 2527815..64b7bb8 100644
--- a/drivers/Spectrum-MI40xxSeries/CMakeLists.txt
+++ b/drivers/Spectrum-MI40xxSeries/CMakeLists.txt
@@ -25,7 +25,11 @@ message("\nIf you have signed the NDA from Spectrum and got a kernel driver tarb
 file(GLOB MILIST "drvsrc_all_V*.tgz" )
 # sort and select last (alphabetic order) tarball driver
 list(SORT MILIST)
-list(GET MILIST -1 MITGZ )
+if(MILIST)
+    list(GET MILIST -1 MITGZ )
+else()
+    set(MITGZ "non-existing-file")
+endif()
 #message(STATUS ${MITGZ})
 
 if(EXISTS ${MITGZ})
@@ -33,9 +37,9 @@ if(EXISTS ${MITGZ})
 	add_custom_command(OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/linux/src_all/micx_drv
 		COMMAND tar xfvz ${MITGZ}
 		COMMAND cp -v ${CMAKE_CURRENT_SOURCE_DIR}/linux/src_all/micx_drv/makefile.kernel26 ${CMAKE_CURRENT_SOURCE_DIR}/linux/src_all/micx_drv/Makefile
-        	WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
 		COMMENT "Unpacking Spectrum driver tarball"
-        	VERBATIM)
+        VERBATIM)
 	set(SPC_SRC "${CMAKE_CURRENT_SOURCE_DIR}/linux/src_all/micx_drv")
 	add_custom_target(spc_smp ALL DEPENDS linux/src_all/micx_drv)
 elseif(DEFINED ENV{SPC_SOURCE})