diff --git a/jumpforth.S b/jumpforth.S
index a172517..9c27ee2 100644
--- a/jumpforth.S
+++ b/jumpforth.S
@@ -454,7 +454,7 @@ defcode NEGATE
 defcode ABS
    pop %eax
    test %eax,%eax
-   jl 0f
+   jnl 0f
    neg %eax
 0: push %eax
    NEXT