diff --git a/src/EWS/camel/camel-ews-utils.c b/src/EWS/camel/camel-ews-utils.c
index 32817df..c8b3f2e 100644
--- a/src/EWS/camel/camel-ews-utils.c
+++ b/src/EWS/camel/camel-ews-utils.c
@@ -1550,7 +1550,7 @@ ews_utils_save_category_changes (GHashTable *old_categories, /* gchar *guid ~> C
 	gboolean changed = FALSE;
 
 	/* cannot save, when evolution is not installed */
-	if (!e_ews_common_utils_gsettings_schema_exists ("org.gnome.evolution.mail"))
+	if (!TRUE)
 		return FALSE;
 
 	if (!old_categories || !new_categories)
@@ -1558,7 +1558,18 @@ ews_utils_save_category_changes (GHashTable *old_categories, /* gchar *guid ~> C
 
 	evo_labels = g_ptr_array_new_full (5, g_free);
 
-	settings = g_settings_new ("org.gnome.evolution.mail");
+	{
+		g_autoptr(GSettingsSchemaSource) schema_source;
+		g_autoptr(GSettingsSchema) schema;
+		schema_source = g_settings_schema_source_new_from_directory("@evo@",
+									    g_settings_schema_source_get_default(),
+									    TRUE,
+									    NULL);
+		schema = g_settings_schema_source_lookup(schema_source,
+							 "org.gnome.evolution.mail",
+							 FALSE);
+		settings = g_settings_new_full(schema, NULL, NULL);
+	}
 	strv = g_settings_get_strv (settings, "labels");
 
 	for (ii = 0; strv && strv[ii]; ii++) {
diff --git a/src/Microsoft365/camel/camel-m365-store.c b/src/Microsoft365/camel/camel-m365-store.c
index 7374c36..dbf9099 100644
--- a/src/Microsoft365/camel/camel-m365-store.c
+++ b/src/Microsoft365/camel/camel-m365-store.c
@@ -305,7 +305,7 @@ m365_store_save_category_changes (GHashTable *old_categories, /* gchar *id ~> Ca
 	gboolean changed = FALSE;
 
 	/* cannot save, when evolution is not installed */
-	if (!e_ews_common_utils_gsettings_schema_exists ("org.gnome.evolution.mail"))
+	if (!TRUE)
 		return FALSE;
 
 	if (!old_categories || !new_categories)
@@ -313,7 +313,18 @@ m365_store_save_category_changes (GHashTable *old_categories, /* gchar *id ~> Ca
 
 	evo_labels = g_ptr_array_new_full (5, g_free);
 
-	settings = g_settings_new ("org.gnome.evolution.mail");
+	{
+		g_autoptr(GSettingsSchemaSource) schema_source;
+		g_autoptr(GSettingsSchema) schema;
+		schema_source = g_settings_schema_source_new_from_directory("@evo@",
+									    g_settings_schema_source_get_default(),
+									    TRUE,
+									    NULL);
+		schema = g_settings_schema_source_lookup(schema_source,
+							 "org.gnome.evolution.mail",
+							 FALSE);
+		settings = g_settings_new_full(schema, NULL, NULL);
+	}
 	strv = g_settings_get_strv (settings, "labels");
 
 	for (ii = 0; strv && strv[ii]; ii++) {
diff --git a/src/Microsoft365/common/e-m365-tz-utils.c b/src/Microsoft365/common/e-m365-tz-utils.c
index cec5417..38f1a87 100644
--- a/src/Microsoft365/common/e-m365-tz-utils.c
+++ b/src/Microsoft365/common/e-m365-tz-utils.c
@@ -192,10 +192,21 @@ e_m365_tz_utils_get_user_timezone (void)
 	gchar *location = NULL;
 	ICalTimezone *zone = NULL;
 
-	if (e_ews_common_utils_gsettings_schema_exists ("org.gnome.evolution.calendar")) {
+	if (TRUE) {
 		GSettings *settings;
 
-		settings = g_settings_new ("org.gnome.evolution.calendar");
+		{
+			g_autoptr(GSettingsSchemaSource) schema_source;
+			g_autoptr(GSettingsSchema) schema;
+			schema_source = g_settings_schema_source_new_from_directory("@evo@",
+										    g_settings_schema_source_get_default(),
+										    TRUE,
+										    NULL);
+			schema = g_settings_schema_source_lookup(schema_source,
+								 "org.gnome.evolution.calendar",
+								 FALSE);
+			settings = g_settings_new_full(schema, NULL, NULL);
+		}
 
 		if (g_settings_get_boolean (settings, "use-system-timezone"))
 			location = e_cal_util_get_system_timezone_location ();
diff --git a/src/common/e-ews-common-utils.c b/src/common/e-ews-common-utils.c
index f388e3b..ed57213 100644
--- a/src/common/e-ews-common-utils.c
+++ b/src/common/e-ews-common-utils.c
@@ -208,10 +208,21 @@ e_ews_common_utils_get_configured_icaltimezone (void)
 	ICalTimezone *zone = NULL;
 	gchar *location = NULL;
 
-	if (e_ews_common_utils_gsettings_schema_exists ("org.gnome.evolution.calendar")) {
+	if (TRUE) {
 		GSettings *settings;
 
-		settings = g_settings_new ("org.gnome.evolution.calendar");
+		{
+			g_autoptr(GSettingsSchemaSource) schema_source;
+			g_autoptr(GSettingsSchema) schema;
+			schema_source = g_settings_schema_source_new_from_directory("@evo@",
+										    g_settings_schema_source_get_default(),
+										    TRUE,
+										    NULL);
+			schema = g_settings_schema_source_lookup(schema_source,
+								 "org.gnome.evolution.calendar",
+								 FALSE);
+			settings = g_settings_new_full(schema, NULL, NULL);
+		}
 
 		if (g_settings_get_boolean (settings, "use-system-timezone"))
 			location = e_cal_util_get_system_timezone_location ();