diff --git a/expat/CMakeLists.txt b/expat/CMakeLists.txt
index 2e80cf06..56312ae3 100644
--- a/expat/CMakeLists.txt
+++ b/expat/CMakeLists.txt
@@ -45,7 +45,7 @@ option(EXPAT_BUILD_TOOLS "build the xmlwf tool for expat library" ${_EXPAT_BUILD
 option(EXPAT_BUILD_EXAMPLES "build the examples for expat library" ON)
 option(EXPAT_BUILD_TESTS "build the tests for expat library" ON)
 option(BUILD_shared "build a shared expat library" ON)
-option(BUILD_doc "build man page for xmlwf" ${_EXPAT_BUILD_DOCS_DEFAULT})
+option(EXPAT_BUILD_DOCS "build man page for xmlwf" ${_EXPAT_BUILD_DOCS_DEFAULT})
 option(BUILD_fuzzers "build fuzzers for the expat library" OFF)
 option(USE_libbsd "utilize libbsd (for arc4random_buf)" OFF)
 option(INSTALL "install expat files in cmake install target" ON)
@@ -290,7 +290,7 @@ if(EXPAT_BUILD_TOOLS)
     set_property(TARGET xmlwf PROPERTY RUNTIME_OUTPUT_DIRECTORY xmlwf)
     target_link_libraries(xmlwf expat)
     expat_install(TARGETS xmlwf DESTINATION ${CMAKE_INSTALL_BINDIR})
-    if(BUILD_doc)
+    if(EXPAT_BUILD_DOCS)
         file(MAKE_DIRECTORY ${PROJECT_BINARY_DIR}/doc)
         add_custom_command(TARGET expat PRE_BUILD COMMAND "${DOCBOOK_TO_MAN}" "${PROJECT_SOURCE_DIR}/doc/xmlwf.xml" && mv "XMLWF.1" "${PROJECT_BINARY_DIR}/doc/xmlwf.1")
         expat_install(FILES "${PROJECT_BINARY_DIR}/doc/xmlwf.1" DESTINATION ${CMAKE_INSTALL_MANDIR}/man1)
@@ -447,7 +447,7 @@ if(WIN32)
     message(STATUS "  Binary postfix ............. ${CMAKE_${_EXPAT_BUILD_TYPE_UPPER}_POSTFIX}")
 endif()
 message(STATUS "")
-message(STATUS "  Build documentation ........ ${BUILD_doc}")
+message(STATUS "  Build documentation ........ ${EXPAT_BUILD_DOCS}")
 message(STATUS "  Build examples ............. ${EXPAT_BUILD_EXAMPLES}")
 message(STATUS "  Build fuzzers .............. ${BUILD_fuzzers}")
 message(STATUS "  Build tests ................ ${EXPAT_BUILD_TESTS}")