diff --git a/code/modules/mob/mob.dm b/code/modules/mob/mob.dm
index b1fb2e809f9..d85addaf1b1 100644
--- a/code/modules/mob/mob.dm
+++ b/code/modules/mob/mob.dm
@@ -268,7 +268,7 @@ proc/isobserver(A)
 	p = 1//1 is the start of any word
 	while(p <= n)//while P, which starts at 1 is less or equal to N which is the length.
 		var/n_letter = copytext(te, p, p + 1)//copies text from a certain distance. In this case, only one letter at a time.
-		if (prob(80) && !(n_letter in list("a","e","i","o","u","A","E","I","O","U")))
+		if (prob(80) && (ckey(n_letter) in list("b","c","d","f","g","h","j","k","l","m","n","p","q","r","s","t","v","w","x","y","z")))
 			if (prob(10))
 				n_letter = text("[n_letter]-[n_letter]-[n_letter]-[n_letter]")//replaces the current letter with this instead.
 			else