diff --git a/kcms/icons/changeicons.cpp b/kcms/icons/changeicons.cpp
--- a/kcms/icons/changeicons.cpp
+++ b/kcms/icons/changeicons.cpp
@@ -32,7 +32,7 @@
     QString themeName = app.arguments().last();
     int idx = themeName.lastIndexOf('/');
     if (idx>=0) {
-        themeName = themeName.mid(idx);
+        themeName = themeName.mid(idx + 1);
     }
 
     IconsSettings settings;