1diff --git a/diffseq.h b/diffseq.h 2index 1974c36..02ef9f2 100644 3--- a/diffseq.h 4+++ b/diffseq.h 5@@ -207,7 +207,7 @@ diag (OFFSET xoff, OFFSET xlim, OFFSET yoff, OFFSET ylim, 6 for (c = 1;; ++c) 7 { 8 OFFSET d; /* Active diagonal. */ 9- bool big_snake = false; 10+ bool big_snake _GL_UNUSED = false; 11 12 /* Extend the top-down search by an edit step in each diagonal. */ 13 if (fmin > dmin) 14