diff --git a/openfisca_france/model/mesures.py b/openfisca_france/model/mesures.py
index fb333a68b9..ae3f7cbf7a 100644
--- a/openfisca_france/model/mesures.py
+++ b/openfisca_france/model/mesures.py
@@ -798,7 +798,7 @@ def formula(menage, period, parameters):
 class prelevement_forfaitaire_unique(Variable):
     value_type = float
     entity = FoyerFiscal
-    label = "Prélèvement forfaitaire unique"
+    label = 'Prélèvement forfaitaire unique'
     definition_period = YEAR
 
     def formula_2018_01_01(foyer_fiscal, period, parameters):
@@ -808,4 +808,4 @@ def formula_2018_01_01(foyer_fiscal, period, parameters):
             + foyer_fiscal('prelevements_sociaux_revenus_capital_hors_csg_crds', period)
             + foyer_fiscal('csg_revenus_capital', period)
             + foyer_fiscal('crds_revenus_capital', period)
-            )
\ No newline at end of file
+            )