1 files changed, 1 insertions, 1 deletions
diff --git a/lib/root.c b/lib/root.c
index a5e7dca..140a3c6 100755
--- a/lib/root.c
+++ b/lib/root.c
@@ -36,7 +36,7 @@ int ts_root(
 {
 	TS_PROLOGUE( ts_root_p );
 	if ( !c ) return -1;
-	fp_t r = ((ts_root_params_t *)c)->r;
+	fp_t r = ((ts_root_params_t const *)c)->r;
 	if (r == 0) return -1;
 
 	for( uint_t i = 0; i < n; ++i )