diff --git a/direct/src/directscripts/Sources.pp b/direct/src/directscripts/Sources.pp
index b6f46d22c3..0f33d11f05 100644
--- a/direct/src/directscripts/Sources.pp
+++ b/direct/src/directscripts/Sources.pp
@@ -1,7 +1,7 @@
-#if $[CTPROJS]
-  // This script is only useful if you're using the ctattach scripts;
-  // therefore, we only bother to install it if you're using the
-  // cattach scripts.
+#if $[and $[CTPROJS],$[WINDOWS_PLATFORM]]
+  // This script is only useful if you're using the ctattach script on
+  // Windows; therefore, we only bother to install it if you're using
+  // the cattach scripts.
   #define INSTALL_SCRIPTS runPythonEmacs
 
 #endif