diff --git a/themes/compact_night.css b/themes/compact_night.css
index cad1fc608..551ec32e4 100644
--- a/themes/compact_night.css
+++ b/themes/compact_night.css
@@ -2304,6 +2304,9 @@ body.flat.ttrss_main #filterNewRuleDlg .dijitValidationTextAreaError {
 body.flat.ttrss_main #filterNewRuleDlg .dijitValidationTextArea:not(.dijitValidationTextAreaError) {
   background: #305030;
 }
+body.flat.ttrss_main .dijitDialog #feed_add_spinner {
+  filter: invert(1);
+}
 /* rules specific to compact.css */
 body.ttrss_main.ttrss_index.flat #feedTree.dijitTree .dijitTreeLabel {
   font-size: 13px ! important;
diff --git a/themes/night.css b/themes/night.css
index 3efdaa99b..fba6de21e 100644
--- a/themes/night.css
+++ b/themes/night.css
@@ -2305,3 +2305,6 @@ body.flat.ttrss_main #filterNewRuleDlg .dijitValidationTextAreaError {
 body.flat.ttrss_main #filterNewRuleDlg .dijitValidationTextArea:not(.dijitValidationTextAreaError) {
   background: #305030;
 }
+body.flat.ttrss_main .dijitDialog #feed_add_spinner {
+  filter: invert(1);
+}
diff --git a/themes/night_base.less b/themes/night_base.less
index e319a2027..ed6fae721 100644
--- a/themes/night_base.less
+++ b/themes/night_base.less
@@ -330,4 +330,11 @@ body.flat.ttrss_main {
 			background : #305030;
 		}
 	}
+
+	.dijitDialog {
+		#feed_add_spinner {
+			filter : invert(1);
+		}
+	}
+
 }
diff --git a/themes/night_blue.css b/themes/night_blue.css
index 1a30ab99b..f30dfff6e 100644
--- a/themes/night_blue.css
+++ b/themes/night_blue.css
@@ -2305,3 +2305,6 @@ body.flat.ttrss_main #filterNewRuleDlg .dijitValidationTextAreaError {
 body.flat.ttrss_main #filterNewRuleDlg .dijitValidationTextArea:not(.dijitValidationTextAreaError) {
   background: #305030;
 }
+body.flat.ttrss_main .dijitDialog #feed_add_spinner {
+  filter: invert(1);
+}