diff --git a/foreign/c/primitives/kawa.scm b/foreign/c/primitives/kawa.scm
index b7b5824..450fffd 100644
--- a/foreign/c/primitives/kawa.scm
+++ b/foreign/c/primitives/kawa.scm
@@ -8,7 +8,9 @@
     (cond ((equal? type 'byte)
            (java.lang.Byte value))
           ((equal? type 'uint8)
-           (java.lang.Byte value))
+           (gnu.math.UnsignedPrim value)
+           ;(java.lang.Int value)
+           )
           ((equal? type 'short)
            (java.lang.Short value))
           ((equal? type 'unsigned-short)