diff --git a/lib/init-7.scm b/lib/init-7.scm
index d2d50515..8be939f3 100644
--- a/lib/init-7.scm
+++ b/lib/init-7.scm
@@ -1040,7 +1040,7 @@
 (define (positive? x) (> x 0))
 (define (negative? x) (< x 0))
 (define (even? n) (= (remainder n 2) 0))
-(define (odd? n) (= (remainder n 2) 1))
+(define (odd? n) (= (abs (remainder n 2)) 1))
 
 (define (abs x) (if (< x 0) (- x) x))