diff --git a/scheme/eval.sld b/scheme/eval.sld
index 29bb8c92..bf046104 100644
--- a/scheme/eval.sld
+++ b/scheme/eval.sld
@@ -82,6 +82,7 @@
         ((boolean? exp) #t)
         ((string? exp) #t)
         ((vector? exp) #t)
+        ((bytevector? exp) #t)
         ((char? exp) #t)
         ((port? exp) #t)
         ((eof-object? exp) #t)