diff --git a/front/public/locales/en/operationalStudies/project.json b/front/public/locales/en/operationalStudies/project.json
index ecb3352e238..62454e0d9e1 100644
--- a/front/public/locales/en/operationalStudies/project.json
+++ b/front/public/locales/en/operationalStudies/project.json
@@ -30,7 +30,7 @@
   "objectives": "goals",
   "openStudy": "Open",
   "projectBudget": "Estimated budget",
-  "projectBudgetInvalid": "The budget for the project must not exceed 2147483647",
+  "projectBudgetInvalid": "The project budget must be a positive integer and must not exceed 2147483647 €",
   "projectCancel": "Cancel",
   "projectCreateButton": "Create project",
   "projectCreationTitle": "Create a project",
diff --git a/front/public/locales/fr/operationalStudies/project.json b/front/public/locales/fr/operationalStudies/project.json
index 8d0d072a221..f0a699213b4 100644
--- a/front/public/locales/fr/operationalStudies/project.json
+++ b/front/public/locales/fr/operationalStudies/project.json
@@ -29,7 +29,7 @@
   "objectives": "objectifs",
   "openStudy": "Ouvrir",
   "projectBudget": "Budget estimé",
-  "projectBudgetInvalid": "Le budget du projet ne doit pas dépasser 2147483647",
+  "projectBudgetInvalid": "Le budget du projet doit être un entier positif et ne doit pas dépasser 2147483647 €",
   "projectCancel": "Annuler",
   "projectCreateButton": "Créer le projet",
   "projectCreationTitle": "Créer un projet",
diff --git a/front/src/modules/project/utils.ts b/front/src/modules/project/utils.ts
index 9012df9ac63..27a5547f335 100644
--- a/front/src/modules/project/utils.ts
+++ b/front/src/modules/project/utils.ts
@@ -21,7 +21,9 @@ const checkProjectFields = (
   objectives: isInvalidString(TEXT_AREA_MAX_LENGTH, project.objectives),
   description: isInvalidString(SMALL_TEXT_AREA_MAX_LENGTH, project.description),
   funders: isInvalidString(TEXT_INPUT_MAX_LENGTH, project.funders),
-  budget: (project.budget ?? 0) > 2147483647,
+  budget:
+    (project.budget ?? 0) > 2147483647 ||
+    (!Number.isInteger(project.budget) && project.budget !== null),
 });
 
 export default checkProjectFields;