diff --git a/CMakeLists.txt b/CMakeLists.txt
index e79c04e8bb..7f354537aa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -417,7 +417,7 @@ elseif (${CMAKE_SYSTEM_NAME} MATCHES "Windows")
     set(CPACK_GENERATOR ZIP)
 endif()
 
-if(NOT ${RESINSIGHT_OCTAVE_PLUGIN_MKOCTFILE} EQUAL "") 
+if(RESINSIGHT_OCTAVE_PLUGIN_MKOCTFILE) 
     get_filename_component(RESINSIGHT_OCTAVE_DIRECTORY ${RESINSIGHT_OCTAVE_PLUGIN_MKOCTFILE} DIRECTORY)
     
     execute_process (COMMAND octave-config -v