diff --git a/Modules/FindBISON.cmake b/Modules/FindBISON.cmake
index 0c622fb53..6021b1202 100644
--- a/Modules/FindBISON.cmake
+++ b/Modules/FindBISON.cmake
@@ -96,7 +96,7 @@ IF(BISON_EXECUTABLE)
   #
   MACRO(BISON_TARGET Name BisonInput BisonOutput)
     SET(BISON_TARGET_output_header "")
-    SET(BISON_TARGET_command_opt "")
+    SET(BISON_TARGET_cmdopt "")
     SET(BISON_TARGET_outputs "${BisonOutput}")
     IF(NOT ${ARGC} EQUAL 3 AND NOT ${ARGC} EQUAL 5 AND NOT ${ARGC} EQUAL 7)
       MESSAGE(SEND_ERROR "Usage")