diff --git a/lang/ninja/src/ninja.sld b/lang/ninja/src/ninja.sld
index bd6ebdb..8164fe7 100644
--- a/lang/ninja/src/ninja.sld
+++ b/lang/ninja/src/ninja.sld
@@ -226,7 +226,7 @@
          ((= (bytevector-u8-ref bv j) (bytevector-u8-ref in-bv (+ index j)))
           (inner-loop (+ j 1)))
          (else #f)))
-     (if (>= (+ index bv-len) (bytevector-length in-bv))
+     (if (> (+ index bv-len) (bytevector-length in-bv))
        #f
        (inner-loop 0)))