diff --git a/cmake/ftxui_fuzzer.cmake b/cmake/ftxui_fuzzer.cmake
index 0377197..5d5d516 100644
--- a/cmake/ftxui_fuzzer.cmake
+++ b/cmake/ftxui_fuzzer.cmake
@@ -1,4 +1,4 @@
-if (FTXUI_BUILD_TESTS_FUZZER)
+if (NOT FTXUI_BUILD_TESTS_FUZZER)
   return()
 endif()