diff --git a/src/sci/impl/namespaces.cljc b/src/sci/impl/namespaces.cljc
index a37672ad..9238937a 100644
--- a/src/sci/impl/namespaces.cljc
+++ b/src/sci/impl/namespaces.cljc
@@ -334,7 +334,7 @@
 (defn has-root-impl [sci-var]
   (vars/hasRoot sci-var))
 
-;;;; Namespaces
+;;;; Namespaces / vars
 
 (defn sci-ns-name [^sci.impl.vars.SciNamespace ns]
   (vars/getName ns))
@@ -451,6 +451,13 @@
            (swap! env assoc-in [:namespaces ns-name var-sym] new-var)
            new-var)))))
 
+(defn sci-bound?
+  [sci-var]
+  ;; see https://github.com/clojure/clojure/blob/cbb3fdf787a00d3c1443794b97ed7fe4bef8e888/src/jvm/clojure/lang/Var.java#L190
+  (or (vars/hasRoot sci-var)
+      (some? (vars/get-thread-binding sci-var))
+      false))
+
 ;;;; End namespaces
 
 ;;;; Eval and read-string
@@ -1072,7 +1079,7 @@
              '-' (copy-core-var -')
              '*' (copy-core-var *')
              'boolean-array (copy-core-var boolean-array)
-             'bound? (copy-core-var bound?)
+             'bound? (copy-core-var sci-bound?)
              'byte-array (copy-core-var byte-array)
              'bigint (copy-core-var bigint)
              'bytes? (copy-core-var bytes?)
diff --git a/test/sci/core_test.cljc b/test/sci/core_test.cljc
index 9f0358bc..086f0ff9 100644
--- a/test/sci/core_test.cljc
+++ b/test/sci/core_test.cljc
@@ -1072,6 +1072,13 @@
     (is (= '(/ 100 (inc 9))
            (eval* "(macroexpand '(->> 9 inc (/ 100)))")))))
 
+(deftest bound-test
+  (is (false? (eval* "(def x) (bound? #'x)")))
+  (is (true?  (eval* "(def x 1) (bound? #'x)")))
+  (is (false? (eval* "(def ^:dynamic x) (bound? #'x)")))
+  (is (true?  (eval* "(def ^:dynamic x) (binding [x 1] (bound? #'x))")))
+  (is (false? (eval* "(def ^:dynamic x) (binding [x 1]) (bound? #'x)"))))
+
 ;;;; Scratch
 
 (comment