diff --git a/tests/ondemand/compilation_failure_tests/CMakeLists.txt b/tests/ondemand/compilation_failure_tests/CMakeLists.txt
index 2d0959be..324edf80 100644
--- a/tests/ondemand/compilation_failure_tests/CMakeLists.txt
+++ b/tests/ondemand/compilation_failure_tests/CMakeLists.txt
@@ -14,6 +14,7 @@ function(add_dual_compile_test TEST_NAME)
 endfunction(add_dual_compile_test)
 
 
+target_compile_options(simdjson-internal-flags INTERFACE -Werror=uninitialized)
 add_dual_compile_test(iterate_char_star)
 add_dual_compile_test(iterate_string_view)
 add_dual_compile_test(iterate_temporary_buffer)