diff --git a/CMakeLists.txt b/CMakeLists.txt
index eb62c96..a9ae409 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,7 +15,7 @@
 project(deepstate)
 cmake_minimum_required(VERSION 2.8)
 
-if (NOT DEFINED BUILD_LIBFUZZER AND DEFINED $ENV{BUILD_LIBFUZZER})
+if (NOT DEFINED BUILD_LIBFUZZER AND DEFINED ENV{BUILD_LIBFUZZER})
   set(BUILD_LIBFUZZER "$ENV{BUILD_LIBFUZZER}")
 endif()