diff --git a/lib/hyperscript/tokenizer.sx b/lib/hyperscript/tokenizer.sx
index 2483ea8c..98933329 100644
--- a/lib/hyperscript/tokenizer.sx
+++ b/lib/hyperscript/tokenizer.sx
@@ -28,6 +28,27 @@
 
 (define hs-ws? (fn (c) (or (= c " ") (= c "\t") (= c "\n") (= c "\r"))))
 
+(define
+  hs-hex-digit?
+  (fn
+    (c)
+    (or
+      (and (>= c "0") (<= c "9"))
+      (and (>= c "a") (<= c "f"))
+      (and (>= c "A") (<= c "F")))))
+
+(define
+  hs-hex-val
+  (fn
+    (c)
+    (let
+      ((code (char-code c)))
+      (cond
+        ((and (>= code 48) (<= code 57))  (- code 48))
+        ((and (>= code 65) (<= code 70))  (- code 55))
+        ((and (>= code 97) (<= code 102)) (- code 87))
+        (true 0)))))
+
 ;; ── Keyword set ───────────────────────────────────────────────────
 
 (define
@@ -308,7 +329,7 @@
                 ()
                 (cond
                   (>= pos src-len)
-                  nil
+                  (error "Unterminated string")
                   (= (hs-cur) "\\")
                   (do
                     (hs-advance! 1)
@@ -318,15 +339,37 @@
                         ((ch (hs-cur)))
                         (cond
                           (= ch "n")
-                          (append! chars "\n")
+                          (do (append! chars "\n") (hs-advance! 1))
                           (= ch "t")
-                          (append! chars "\t")
+                          (do (append! chars "\t") (hs-advance! 1))
+                          (= ch "r")
+                          (do (append! chars "\r") (hs-advance! 1))
+                          (= ch "b")
+                          (do (append! chars (char-from-code 8)) (hs-advance! 1))
+                          (= ch "f")
+                          (do (append! chars (char-from-code 12)) (hs-advance! 1))
+                          (= ch "v")
+                          (do (append! chars (char-from-code 11)) (hs-advance! 1))
                           (= ch "\\")
-                          (append! chars "\\")
+                          (do (append! chars "\\") (hs-advance! 1))
                           (= ch quote-char)
-                          (append! chars quote-char)
-                          :else (do (append! chars "\\") (append! chars ch)))
-                        (hs-advance! 1)))
+                          (do (append! chars quote-char) (hs-advance! 1))
+                          (= ch "x")
+                          (do
+                            (hs-advance! 1)
+                            (if
+                              (and
+                                (< (+ pos 1) src-len)
+                                (hs-hex-digit? (hs-cur))
+                                (hs-hex-digit? (hs-peek 1)))
+                              (let
+                                ((d1 (hs-hex-val (hs-cur)))
+                                 (d2 (hs-hex-val (hs-peek 1))))
+                                (append! chars (char-from-code (+ (* d1 16) d2)))
+                                (hs-advance! 2))
+                              (error "Invalid hexadecimal escape: \\x")))
+                          :else
+                          (do (append! chars "\\") (append! chars ch) (hs-advance! 1)))))
                     (loop))
                   (= (hs-cur) quote-char)
                   (hs-advance! 1)