diff --git a/vignettes/V02.2_param_mcmc.Rmd b/vignettes/V02.2_param_mcmc.Rmd
index 391e315b1d5645f1df09d01dbb5450df931907ff..02e9c5520c37833183840c03c4cb226d062b8888 100644
--- a/vignettes/V02.2_param_mcmc.Rmd
+++ b/vignettes/V02.2_param_mcmc.Rmd
@@ -68,7 +68,7 @@ LogLikeGR4J <- function(ParamOptim) {
                                        RunOptions = RunOptions,
                                        Param = RawParamOptim)
   ## Computation of the log-likelihood: N * log(SS)
-  ObsY <- InputsCrit$Qobs
+  ObsY <- InputsCrit$Obs
   ModY <- OutputsModel$Qsim
   LogLike <- sum(!is.na(ObsY)) * log(sum((ObsY - ModY)^2, na.rm = TRUE))
 }