--- a/share/functions/setenv.fish	
+++ a/share/functions/setenv.fish	
@@ -1,4 +1,8 @@ 
 
 function setenv --description 'Set global variable. Alias for set -g, made for csh compatibility'
-    set -gx $argv
+    if string match -q PATH -- $argv[1]
+        set -gx (string replace -a : \n -- $argv)
+    else
+        set -gx $argv
+    end
 end