diff --git a/src/img2pdf.py b/src/img2pdf.py
index 9f9cba7..efc56c2 100755
--- a/src/img2pdf.py
+++ b/src/img2pdf.py
@@ -2510,7 +2510,7 @@ def input_images(path_expr):
             # paths without wildcards that do not exist will trigger "does not exist"
             from glob import glob
 
-            paths = glob(path_expr)
+            paths = sorted(glob(path_expr))
         for path in paths:
             try:
                 if os.path.getsize(path) == 0: