diff --git a/UI/data/themes/Acri.qss b/UI/data/themes/Acri.qss
index 50f0ea79a..4e480a4ba 100644
--- a/UI/data/themes/Acri.qss
+++ b/UI/data/themes/Acri.qss
@@ -300,8 +300,8 @@ QDockWidget {
     font-size: 10.5pt;
     font-weight: bold;
 
-    titlebar-close-icon: url('./Dark/Close.svg');
-    titlebar-normal-icon: url('./Dark/Popout.svg');
+    titlebar-close-icon: url('./Dark/close.svg');
+    titlebar-normal-icon: url('./Dark/popout.svg');
 }
 
 QDockWidget::title {
diff --git a/UI/data/themes/Grey.qss b/UI/data/themes/Grey.qss
index 34a6cdf1e..e5986648e 100644
--- a/UI/data/themes/Grey.qss
+++ b/UI/data/themes/Grey.qss
@@ -300,8 +300,8 @@ QDockWidget {
     font-size: 10.5pt;
     font-weight: bold;
 
-    titlebar-close-icon: url('./Dark/Close.svg');
-    titlebar-normal-icon: url('./Dark/Popout.svg');
+    titlebar-close-icon: url('./Dark/close.svg');
+    titlebar-normal-icon: url('./Dark/popout.svg');
 }
 
 QDockWidget::title {
diff --git a/UI/data/themes/Light.qss b/UI/data/themes/Light.qss
index 1e6c8eb61..d8e7e968a 100644
--- a/UI/data/themes/Light.qss
+++ b/UI/data/themes/Light.qss
@@ -300,8 +300,8 @@ QDockWidget {
     font-size: 10.5pt;
     font-weight: bold;
 
-    titlebar-close-icon: url('./Light/Close.svg');
-    titlebar-normal-icon: url('./Light/Popout.svg');
+    titlebar-close-icon: url('./Light/close.svg');
+    titlebar-normal-icon: url('./Light/popout.svg');
 }
 
 QDockWidget::title {
diff --git a/UI/data/themes/Rachni.qss b/UI/data/themes/Rachni.qss
index 9f729a1e8..db7baac4f 100644
--- a/UI/data/themes/Rachni.qss
+++ b/UI/data/themes/Rachni.qss
@@ -302,8 +302,8 @@ QDockWidget {
     font-size: 10.5pt;
     font-weight: bold;
 
-    titlebar-close-icon: url('./Dark/Close.svg');
-    titlebar-normal-icon: url('./Dark/Popout.svg');
+    titlebar-close-icon: url('./Dark/close.svg');
+    titlebar-normal-icon: url('./Dark/popout.svg');
 }
 
 QDockWidget::title {
diff --git a/UI/data/themes/Yami.qss b/UI/data/themes/Yami.qss
index 1d1111731..dfadf0eed 100644
--- a/UI/data/themes/Yami.qss
+++ b/UI/data/themes/Yami.qss
@@ -304,8 +304,8 @@ QDockWidget {
     font-size: 10.5pt;
     font-weight: bold;
 
-    titlebar-close-icon: url('./Dark/Close.svg');
-    titlebar-normal-icon: url('./Dark/Popout.svg');
+    titlebar-close-icon: url('./Dark/close.svg');
+    titlebar-normal-icon: url('./Dark/popout.svg');
 }
 
 QDockWidget::title {