diff --git a/cmake/ftxui_fuzzer.cmake b/cmake/ftxui_fuzzer.cmake
index 037719722cf03de1f8547bdbe3b93385bf01930c..5d5d5168521e33a6a7048d9449c08f860c672086 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()