diff --git a/txexpr/base.rkt b/txexpr/base.rkt
index ffc67d0..3893d6a 100644
--- a/txexpr/base.rkt
+++ b/txexpr/base.rkt
@@ -151,11 +151,11 @@
 (define+provide+safe (txexpr tag [attrs null] [elements null])
   ((symbol?) (txexpr-attrs? txexpr-elements?) . ->* . txexpr?)
   (unless (txexpr-tag? tag)
-    (error 'txexpr (format "This is not a txexpr-tag: ~v" tag)))
+    (raise-argument-error 'txexpr "txexpr-tag?" tag))
   (unless (txexpr-attrs? attrs)
-    (error 'txexpr (format "This is not a list of txexpr-attrs: ~v" attrs)))
+    (raise-argument-error 'txexpr "txexpr-attrs?" attrs))
   (unless (txexpr-elements? elements)
-    (error 'txexpr (format "This is not a list of txexpr-elements: ~v" elements)))
+    (raise-argument-error 'txexpr "txexpr-elements?" elements))
   
   (define result (cons tag (append (if (empty? attrs) empty (list attrs)) elements)))
   (unless (txexpr? result)