diff --git a/CMakeLists.txt b/CMakeLists.txt
index a56871fbece..f6f34b71b2a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -679,7 +679,7 @@ if (BUILD_TESTING)
         target_link_libraries(fuzztest PUBLIC ${PROJECT_NAME})
 
         # Set default values for fuzzing if not defined
-        if(NOT DEFINED FUZZ_TIMEOUT_SEC)
+        if(NOT DEFINED ENV{FUZZ_TIMEOUT_SEC})
             set(FUZZ_TIMEOUT_SEC 60)
         endif()