diff --git a/rosidl_typesupport_fastrtps_c/cmake/rosidl_typesupport_fastrtps_c_generate_interfaces.cmake b/rosidl_typesupport_fastrtps_c/cmake/rosidl_typesupport_fastrtps_c_generate_interfaces.cmake
index 9782a3d..4af57d8 100644
--- a/rosidl_typesupport_fastrtps_c/cmake/rosidl_typesupport_fastrtps_c_generate_interfaces.cmake
+++ b/rosidl_typesupport_fastrtps_c/cmake/rosidl_typesupport_fastrtps_c_generate_interfaces.cmake
@@ -221,7 +221,8 @@ if(BUILD_TESTING AND rosidl_generate_interfaces_ADD_LINTER_TESTS)
     ament_uncrustify(
       TESTNAME "uncrustify_rosidl_typesupport_fastrtps_c"
       # the generated code might contain longer lines for templated types
-      MAX_LINE_LENGTH 999
+      # set the value to zero to tell uncrustify to ignore line lengths
+      MAX_LINE_LENGTH 0
       ${_generated_files})
   endif()
 endif()
diff --git a/rosidl_typesupport_fastrtps_cpp/cmake/rosidl_typesupport_fastrtps_cpp_generate_interfaces.cmake b/rosidl_typesupport_fastrtps_cpp/cmake/rosidl_typesupport_fastrtps_cpp_generate_interfaces.cmake
index a756173..15157c8 100644
--- a/rosidl_typesupport_fastrtps_cpp/cmake/rosidl_typesupport_fastrtps_cpp_generate_interfaces.cmake
+++ b/rosidl_typesupport_fastrtps_cpp/cmake/rosidl_typesupport_fastrtps_cpp_generate_interfaces.cmake
@@ -218,7 +218,8 @@ if(BUILD_TESTING AND rosidl_generate_interfaces_ADD_LINTER_TESTS)
     ament_uncrustify(
       TESTNAME "uncrustify_rosidl_typesupport_fastrtps_cpp"
       # the generated code might contain longer lines for templated types
-      MAX_LINE_LENGTH 999
+      # set the value to zero to tell uncrustify to ignore line lengths
+      MAX_LINE_LENGTH 0
       ${_generated_files})
   endif()
 endif()