diff --git a/src/Gui/Stylesheets/CMakeLists.txt b/src/Gui/Stylesheets/CMakeLists.txt
index d19446c0d595..f4db3406f32e 100644
--- a/src/Gui/Stylesheets/CMakeLists.txt
+++ b/src/Gui/Stylesheets/CMakeLists.txt
@@ -1,11 +1,11 @@
 
 SET(Stylesheets_Files
-    "Dark - blue.qss"
-    "Dark - green.qss"
-    "Dark - orange.qss"
-    "Light - blue.qss"
-    "Light - green.qss"
-    "Light - orange.qss"
+    "Dark-blue.qss"
+    "Dark-green.qss"
+    "Dark-orange.qss"
+    "Light-blue.qss"
+    "Light-green.qss"
+    "Light-orange.qss"
 )
 
 # Find all the image files
diff --git a/src/Gui/Stylesheets/Dark - blue.qss b/src/Gui/Stylesheets/Dark-blue.qss
similarity index 100%
rename from src/Gui/Stylesheets/Dark - blue.qss
rename to src/Gui/Stylesheets/Dark-blue.qss
diff --git a/src/Gui/Stylesheets/Dark - green.qss b/src/Gui/Stylesheets/Dark-green.qss
similarity index 100%
rename from src/Gui/Stylesheets/Dark - green.qss
rename to src/Gui/Stylesheets/Dark-green.qss
diff --git a/src/Gui/Stylesheets/Dark - orange.qss b/src/Gui/Stylesheets/Dark-orange.qss
similarity index 100%
rename from src/Gui/Stylesheets/Dark - orange.qss
rename to src/Gui/Stylesheets/Dark-orange.qss
diff --git a/src/Gui/Stylesheets/Light - blue.qss b/src/Gui/Stylesheets/Light-blue.qss
similarity index 100%
rename from src/Gui/Stylesheets/Light - blue.qss
rename to src/Gui/Stylesheets/Light-blue.qss
diff --git a/src/Gui/Stylesheets/Light - green.qss b/src/Gui/Stylesheets/Light-green.qss
similarity index 100%
rename from src/Gui/Stylesheets/Light - green.qss
rename to src/Gui/Stylesheets/Light-green.qss
diff --git a/src/Gui/Stylesheets/Light - orange.qss b/src/Gui/Stylesheets/Light-orange.qss
similarity index 100%
rename from src/Gui/Stylesheets/Light - orange.qss
rename to src/Gui/Stylesheets/Light-orange.qss