diff --git a/src/ViewModels/Preference.cs b/src/ViewModels/Preference.cs
index 70f0041f..1ccee4cd 100644
--- a/src/ViewModels/Preference.cs
+++ b/src/ViewModels/Preference.cs
@@ -65,7 +65,8 @@ namespace SourceGit.ViewModels
             get => _defaultFontFamily;
             set
             {
-                if (SetProperty(ref _defaultFontFamily, value) && !_isLoading)
+                var trimmed = value.Trim();
+                if (SetProperty(ref _defaultFontFamily, trimmed) && !_isLoading)
                     App.SetFonts(_defaultFontFamily, _monospaceFontFamily, _onlyUseMonoFontInEditor);
             }
         }
@@ -75,7 +76,8 @@ namespace SourceGit.ViewModels
             get => _monospaceFontFamily;
             set
             {
-                if (SetProperty(ref _monospaceFontFamily, value) && !_isLoading)
+                var trimmed = value.Trim();
+                if (SetProperty(ref _monospaceFontFamily, trimmed) && !_isLoading)
                     App.SetFonts(_defaultFontFamily, _monospaceFontFamily, _onlyUseMonoFontInEditor);
             }
         }