diff --git a/pkgs/contract-profile/main.rkt b/pkgs/contract-profile/main.rkt
index d7e5acc8e8..ce98c8bc11 100644
--- a/pkgs/contract-profile/main.rkt
+++ b/pkgs/contract-profile/main.rkt
@@ -191,7 +191,7 @@
      (printf "~a[label=\"~a\"][color=\"~a\"]\n"
              (hash-ref nodes->names n)
              n
-             (if (hash-ref nodes->typed? n) "green" "red")))
+             (if (hash-ref nodes->typed? n #f) "green" "red")))
    (for ([(k v) (in-hash edge-samples)])
      (match-define (cons pos neg) k)
      (printf "~a -> ~a[label=\"~ams\"]\n"
diff --git a/pkgs/contract-profile/utils.rkt b/pkgs/contract-profile/utils.rkt
index 89b658048e..3895e09838 100644
--- a/pkgs/contract-profile/utils.rkt
+++ b/pkgs/contract-profile/utils.rkt
@@ -1,6 +1,6 @@
 #lang racket/base
 
-(require racket/port)
+(require racket/port racket/contract)
 
 (provide (all-defined-out))
 
@@ -33,3 +33,13 @@
       (with-output-to-file file
         #:exists 'replace
         (lambda () body ...))))
+
+;; for debugging
+(define (print-blame b)
+  (printf (string-append "#<blame positive=~a\n"
+                         "        negative=~a\n"
+                         "        contract=~a\n"
+                         "        value=~a\n"
+                         "        source=~a>\n")
+          (blame-positive b) (blame-negative b)
+          (blame-contract b) (blame-value b) (blame-source b)))