diff --git a/cmake/generateConfigFile.cmake b/cmake/generateConfigFile.cmake
index e7a07f73..07136e18 100644
--- a/cmake/generateConfigFile.cmake
+++ b/cmake/generateConfigFile.cmake
@@ -13,7 +13,11 @@ set(EXV_HAVE_PRINTUCS2   ${EXIV2_ENABLE_PRINTUCS2})
 set(EXV_PACKAGE          ${PACKAGE})
 set(EXV_PACKAGE_VERSION  ${PACKAGE_VERSION})
 set(EXV_PACKAGE_STRING   ${PACKAGE_STRING})
-set(EXV_HAVE_XMP_TOOLKIT ${EXIV2_ENABLE_XMP} OR ${EXIV2_ENABLE_EXTERNAL_XMP})
+if (${EXIV2_ENABLE_XMP} OR ${EXIV2_ENABLE_EXTERNAL_XMP})
+    set(EXV_HAVE_XMP_TOOLKIT ON)
+else()
+    set(EXV_HAVE_XMP_TOOLKIT OFF)
+endif()
 set(EXV_HAVE_ICONV       ${ICONV_FOUND})
 set(EXV_HAVE_LIBZ        ${ZLIB_FOUND})
 set(EXV_UNICODE_PATH     ${EXIV2_ENABLE_WIN_UNICODE})