diff --git a/CHANGELOG.md b/CHANGELOG.md
index e2f6412..c236ffb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
  * Add + button to time log widget in side bar to have a simplified log entry dialog (without summary or report option)
  * Allow click-and-drag mouse select on lines with checkbox, to capture the checkbox as well as the text.
  * Allow changing the date when logging time (rather than having to go to that date before clicking on adding time log/opening time log manager)
+ * Ensure time log reports have an extension
 
 # 0.5.4
 
diff --git a/bouquin/time_log.py b/bouquin/time_log.py
index 7e6ebfa..bf45680 100644
--- a/bouquin/time_log.py
+++ b/bouquin/time_log.py
@@ -1076,6 +1076,8 @@ class TimeReportDialog(QDialog):
         )
         if not filename:
             return
+        if not filename.endswith(".csv"):
+            filename = f"{filename}.csv"
 
         try:
             with open(filename, "w", newline="", encoding="utf-8") as f:
@@ -1124,6 +1126,8 @@ class TimeReportDialog(QDialog):
         )
         if not filename:
             return
+        if not filename.endswith(".pdf"):
+            filename = f"{filename}.pdf"
 
         # ---------- Build chart image (hours per period) ----------
         per_period_minutes: dict[str, int] = defaultdict(int)
diff --git a/pyproject.toml b/pyproject.toml
index d1f9798..3cbdafc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "bouquin"
-version = "0.5.4"
+version = "0.5.5"
 description = "Bouquin is a simple, opinionated notebook application written in Python, PyQt and SQLCipher."
 authors = ["Miguel Jacq <mig@mig5.net>"]
 readme = "README.md"