diff --git a/pagetop/src/base/theme/aliner.rs b/pagetop/src/base/theme/aliner.rs
index daa58761..28bdf386 100644
--- a/pagetop/src/base/theme/aliner.rs
+++ b/pagetop/src/base/theme/aliner.rs
@@ -17,7 +17,7 @@ impl ThemeTrait for Aliner {
 
     fn before_render_page(&self, page: &mut Page) {
         page.alter_context(PageOp::AddFavicon(
-            Favicon::new().with_icon("/theme/favicon.png"),
+            Favicon::new().with_icon("/theme/favicon.ico"),
         ))
         .alter_context(PageOp::AddStyleSheet(
             StyleSheet::located("/aliner/css/styles.css").with_weight(-99),
diff --git a/pagetop/src/base/theme/bootsier.rs b/pagetop/src/base/theme/bootsier.rs
index 090c0085..a824b0da 100644
--- a/pagetop/src/base/theme/bootsier.rs
+++ b/pagetop/src/base/theme/bootsier.rs
@@ -19,7 +19,7 @@ impl ThemeTrait for Bootsier {
 
     fn before_render_page(&self, page: &mut Page) {
         page.alter_context(PageOp::AddFavicon(
-            Favicon::new().with_icon("/theme/favicon.png"),
+            Favicon::new().with_icon("/theme/favicon.ico"),
         ))
         .alter_context(PageOp::AddStyleSheet(
             StyleSheet::located("/bootsier/css/bootstrap.min.css")
diff --git a/pagetop/src/base/theme/bulmix.rs b/pagetop/src/base/theme/bulmix.rs
index 41edb458..90ce8c9c 100644
--- a/pagetop/src/base/theme/bulmix.rs
+++ b/pagetop/src/base/theme/bulmix.rs
@@ -17,7 +17,7 @@ impl ThemeTrait for Bulmix {
 
     fn before_render_page(&self, page: &mut Page) {
         page.alter_context(PageOp::AddFavicon(
-            Favicon::new().with_icon("/theme/favicon.png"),
+            Favicon::new().with_icon("/theme/favicon.ico"),
         ))
         .alter_context(PageOp::AddStyleSheet(
             StyleSheet::located("/bulmix/css/bulma.min.css")
diff --git a/pagetop/src/core/theme/definition.rs b/pagetop/src/core/theme/definition.rs
index 7dd880f0..3234fe78 100644
--- a/pagetop/src/core/theme/definition.rs
+++ b/pagetop/src/core/theme/definition.rs
@@ -29,7 +29,7 @@ pub trait ThemeTrait: BaseTheme + Send + Sync {
     #[allow(unused_variables)]
     fn before_render_page(&self, page: &mut Page) {
         page.alter_context(PageOp::AddFavicon(
-            Favicon::new().with_icon("/theme/favicon.png"),
+            Favicon::new().with_icon("/theme/favicon.ico"),
         ));
     }
 
diff --git a/pagetop/static/theme/favicon.ico b/pagetop/static/theme/favicon.ico
new file mode 100644
index 00000000..95e1affa
Binary files /dev/null and b/pagetop/static/theme/favicon.ico differ
diff --git a/pagetop/static/theme/favicon.png b/pagetop/static/theme/favicon.png
deleted file mode 100644
index 7d38ea4a..00000000
Binary files a/pagetop/static/theme/favicon.png and /dev/null differ