diff --git a/inginious/common/tasks_problems.py b/inginious/common/tasks_problems.py
index fd07d16b8..f7eb00e62 100644
--- a/inginious/common/tasks_problems.py
+++ b/inginious/common/tasks_problems.py
@@ -187,6 +187,7 @@ def parse_problem(self, problem_content):
                 offset = int(problem_content["offset"])
                 if offset < 1:
                     raise Exception("Line offset must be positive!")
+                problem_content["offset"] = offset
             except ValueError:
                 raise Exception("Line offset must be an integer!")
         return Problem.parse_problem(problem_content)