diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9764d2b746..7509a5b339 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -43,7 +43,7 @@ endif()
 
 # enable extended messages of many OCCT algorithms
 set (OCCT_ALGO_EXTENDED_OUTPUT OFF CACHE BOOL "${OCCT_ALGO_EXTENDED_OUTPUT_DESCR}")
-if (OCCT_ALGO_EXTENDED_OUTPUT_DESCR)
+if (OCCT_ALGO_EXTENDED_OUTPUT)
   add_definitions (-DOCCT_DEBUG)
 endif()