diff --git a/CHANGELOG.md b/CHANGELOG.md
index 592e1ff9..fff4fb16 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Fixes
 - Arch
   - regression: not displaying ignored updates
+  - dependency size: display a '?' instead of '0' ('?' should only be displayed when the size is unknown)
 
 - Debian
   - packages descriptions are not displayed on the system's default language (when available)
diff --git a/bauh/gems/arch/confirmation.py b/bauh/gems/arch/confirmation.py
index b461f999..ec716cc2 100644
--- a/bauh/gems/arch/confirmation.py
+++ b/bauh/gems/arch/confirmation.py
@@ -26,7 +26,7 @@ def request_optional_deps(pkgname: str, pkg_repos: dict, watcher: ProcessWatcher
                                                          i18n['repository'],
                                                          d['repository'].lower(),
                                                          i18n['size'].capitalize(),
-                                                         get_human_size_str(size) if size else '?'), p)
+                                                         get_human_size_str(size) if size is not None else '?'), p)
         op.icon_path = _get_repo_icon(d['repository'])
         opts.append(op)
 
@@ -58,7 +58,7 @@ def request_install_missing_deps(pkgname: Optional[str], deps: List[Tuple[str, s
                                                        i18n['repository'],
                                                        dep[1].lower(),
                                                        i18n['size'].capitalize(),
-                                                       get_human_size_str(size) if size else '?'), dep[0])
+                                                       get_human_size_str(size) if size is not None else '?'), dep[0])
         op.read_only = True
         op.icon_path = _get_repo_icon(dep[1])
         opts.append(op)
diff --git a/bauh/gems/arch/updates.py b/bauh/gems/arch/updates.py
index 888e3833..e4c55844 100644
--- a/bauh/gems/arch/updates.py
+++ b/bauh/gems/arch/updates.py
@@ -335,7 +335,7 @@ class UpdatesSummarizer:
     
                 current_size = installed_sizes.get(pkg.name) if installed_sizes else None
 
-                if current_size is not None and pkgdata['s']:
+                if current_size is not None and pkgdata['s'] is not None:
                     requirement.extra_size = pkgdata['s'] - current_size
 
             required_by = set()