diff --git a/partner_statement/report/activity_statement_xlsx.py b/partner_statement/report/activity_statement_xlsx.py
index ed18209d1e5..ab245319c8c 100644
--- a/partner_statement/report/activity_statement_xlsx.py
+++ b/partner_statement/report/activity_statement_xlsx.py
@@ -324,7 +324,11 @@ def _size_columns(self, sheet, data):
             sheet.set_column(0, i, 20)
 
     def generate_xlsx_report(self, workbook, data, objects):
-        lang = objects.lang or self.env.user.partner_id.lang
+        lang = (
+            objects.lang
+            if len(objects) == 1 and objects.lang
+            else self.env.user.partner_id.lang
+        )
         self = self.with_context(lang=lang)
         report_model = self.env["report.partner_statement.activity_statement"]
         self._define_formats(workbook)
diff --git a/partner_statement/report/detailed_activity_statement_xlsx.py b/partner_statement/report/detailed_activity_statement_xlsx.py
index 09b7aba7416..e4f9d3a16f3 100644
--- a/partner_statement/report/detailed_activity_statement_xlsx.py
+++ b/partner_statement/report/detailed_activity_statement_xlsx.py
@@ -470,7 +470,11 @@ def _size_columns(self, sheet, data):
             sheet.set_column(0, i, 20)
 
     def generate_xlsx_report(self, workbook, data, objects):
-        lang = objects.lang or self.env.user.partner_id.lang
+        lang = (
+            objects.lang
+            if len(objects) == 1 and objects.lang
+            else self.env.user.partner_id.lang
+        )
         self = self.with_context(lang=lang)
         report_model = self.env["report.partner_statement.detailed_activity_statement"]
         self._define_formats(workbook)
diff --git a/partner_statement/report/outstanding_statement_xlsx.py b/partner_statement/report/outstanding_statement_xlsx.py
index 592d17ed67e..ce792b953d4 100644
--- a/partner_statement/report/outstanding_statement_xlsx.py
+++ b/partner_statement/report/outstanding_statement_xlsx.py
@@ -242,7 +242,11 @@ def _size_columns(self, sheet, data):
             sheet.set_column(0, i, 20)
 
     def generate_xlsx_report(self, workbook, data, objects):
-        lang = objects.lang or self.env.user.partner_id.lang
+        lang = (
+            objects.lang
+            if len(objects) == 1 and objects.lang
+            else self.env.user.partner_id.lang
+        )
         self = self.with_context(lang=lang)
         report_model = self.env["report.partner_statement.outstanding_statement"]
         self._define_formats(workbook)