diff --git a/src/fst/morphology/phonology.xfscript b/src/fst/morphology/phonology.xfscript
index 41ae9f0..17ba9d1 100644
--- a/src/fst/morphology/phonology.xfscript
+++ b/src/fst/morphology/phonology.xfscript
@@ -50,10 +50,10 @@ define hToneSpread a a -> á á, a -> á,
                    i i -> í í, i -> í,
                    o o -> ó ó, o -> ó,
                    u u -> ú ú, u -> ú || 
-                        "^H" (consonant)+ _, 
-                        "^H" (consonant)+ (unmarkedVowel)+ (consonant)+ _,
+                        "^H" (consonant)+ _ \".", 
+                        "^H" (consonant)+ (unmarkedVowel)+ (consonant)+ _ \".",
                         "^H" (consonant)+ (unmarkedVowel)+ 
-                          (consonant)+ (unmarkedVowel)+ (consonant)+ _;
+                          (consonant)+ (unmarkedVowel)+ (consonant)+ _ \".";
 define hToneSpreadCleanup "^H" -> 0;
 
 regex [ hToneSpreadAfterMid .o. hToneSpread .o. hToneSpreadCleanup ];