diff --git a/shell/platform/linux/fl_accessible_text_field.cc b/shell/platform/linux/fl_accessible_text_field.cc
index 9dcc7f64fb820..670f0bb59a997 100644
--- a/shell/platform/linux/fl_accessible_text_field.cc
+++ b/shell/platform/linux/fl_accessible_text_field.cc
@@ -387,7 +387,7 @@ static gboolean fl_accessible_text_field_set_caret_offset(AtkText* text,
   FlAccessibleTextField* self = FL_ACCESSIBLE_TEXT_FIELD(text);
 
   perform_set_selection_action(self, offset, offset);
-  return true;
+  return TRUE;
 }
 
 // Implements AtkText::get_n_selections.
@@ -435,11 +435,11 @@ static gboolean fl_accessible_text_field_add_selection(AtkText* text,
   FlAccessibleTextField* self = FL_ACCESSIBLE_TEXT_FIELD(text);
 
   if (self->selection_base != self->selection_extent) {
-    return false;
+    return FALSE;
   }
 
   perform_set_selection_action(self, start_offset, end_offset);
-  return true;
+  return TRUE;
 }
 
 // Implements AtkText::remove_selection.
@@ -449,12 +449,12 @@ static gboolean fl_accessible_text_field_remove_selection(AtkText* text,
   FlAccessibleTextField* self = FL_ACCESSIBLE_TEXT_FIELD(text);
 
   if (selection_num != 0 || self->selection_base == self->selection_extent) {
-    return false;
+    return FALSE;
   }
 
   perform_set_selection_action(self, self->selection_extent,
                                self->selection_extent);
-  return true;
+  return TRUE;
 }
 
 // Implements AtkText::set_selection.
@@ -466,11 +466,11 @@ static gboolean fl_accessible_text_field_set_selection(AtkText* text,
   FlAccessibleTextField* self = FL_ACCESSIBLE_TEXT_FIELD(text);
 
   if (selection_num != 0) {
-    return false;
+    return FALSE;
   }
 
   perform_set_selection_action(self, start_offset, end_offset);
-  return true;
+  return TRUE;
 }
 
 // Implements AtkEditableText::set_text_contents.
diff --git a/shell/platform/linux/fl_gnome_settings.cc b/shell/platform/linux/fl_gnome_settings.cc
index 31556e53b9e16..e20b1bb053091 100644
--- a/shell/platform/linux/fl_gnome_settings.cc
+++ b/shell/platform/linux/fl_gnome_settings.cc
@@ -64,11 +64,11 @@ static FlColorScheme fl_gnome_settings_get_color_scheme(FlSettings* settings) {
 }
 
 static gboolean fl_gnome_settings_get_enable_animations(FlSettings* settings) {
-  return true;
+  return TRUE;
 }
 
 static gboolean fl_gnome_settings_get_high_contrast(FlSettings* settings) {
-  return false;
+  return FALSE;
 }
 
 static gdouble fl_gnome_settings_get_text_scaling_factor(FlSettings* settings) {
diff --git a/shell/platform/linux/fl_renderer.cc b/shell/platform/linux/fl_renderer.cc
index 3fdaef624cd6b..22f16d12367d4 100644
--- a/shell/platform/linux/fl_renderer.cc
+++ b/shell/platform/linux/fl_renderer.cc
@@ -398,7 +398,7 @@ gboolean fl_renderer_present_layers(FlRenderer* self,
       layers[0]->offset.x == 0 && layers[0]->offset.y == 0 &&
       (layers[0]->size.width != priv->target_width ||
        layers[0]->size.height != priv->target_height)) {
-    return true;
+    return TRUE;
   }
 
   priv->had_first_frame = true;
diff --git a/shell/platform/linux/fl_settings_portal.cc b/shell/platform/linux/fl_settings_portal.cc
index 1cb93240dc942..a3eded35263d7 100644
--- a/shell/platform/linux/fl_settings_portal.cc
+++ b/shell/platform/linux/fl_settings_portal.cc
@@ -123,25 +123,25 @@ static gboolean settings_portal_read(GDBusProxy* proxy,
     if (error->domain == G_DBUS_ERROR &&
         error->code == G_DBUS_ERROR_SERVICE_UNKNOWN) {
       g_debug("XDG desktop portal unavailable: %s", error->message);
-      return false;
+      return FALSE;
     }
 
     if (error->domain == G_DBUS_ERROR &&
         error->code == G_DBUS_ERROR_UNKNOWN_METHOD) {
       g_debug("XDG desktop portal settings unavailable: %s", error->message);
-      return false;
+      return FALSE;
     }
 
     g_critical("Failed to read XDG desktop portal settings: %s",
                error->message);
-    return false;
+    return FALSE;
   }
 
   g_autoptr(GVariant) child = nullptr;
   g_variant_get(value, "(v)", &child);
   g_variant_get(child, "v", out);
 
-  return true;
+  return TRUE;
 }
 
 static void settings_portal_changed_cb(GDBusProxy* proxy,
@@ -282,7 +282,7 @@ gboolean fl_settings_portal_start(FlSettingsPortal* self, GError** error) {
       kPortalPath, kPortalSettings, nullptr, error);
 
   if (self->dbus_proxy == nullptr) {
-    return false;
+    return FALSE;
   }
 
   for (const FlSetting setting : kAllSettings) {
diff --git a/shell/platform/linux/fl_view_accessible.cc b/shell/platform/linux/fl_view_accessible.cc
index 77ba12aec1282..d8e3b74747930 100644
--- a/shell/platform/linux/fl_view_accessible.cc
+++ b/shell/platform/linux/fl_view_accessible.cc
@@ -187,7 +187,7 @@ void fl_view_accessible_handle_update_semantics(
         }
         fl_accessible_node_set_children(parent, children);
 
-        return true;
+        return TRUE;
       },
       self);
 }