diff --git a/libtransmission/utils-test.c b/libtransmission/utils-test.c
index 7dc46427d..eed24edb6 100644
--- a/libtransmission/utils-test.c
+++ b/libtransmission/utils-test.c
@@ -246,11 +246,18 @@ test_memmem( void )
 int
 main( void )
 {
+    char buf[32];
     char *in, *out;
     int   len;
     int   i;
     int   l;
 
+    /* tr_truncd */
+    tr_snprintf( buf, sizeof( buf ), "%.2f%%", 99.999 );
+    check( !strcmp( buf, "100.00%" ) );
+    tr_snprintf( buf, sizeof( buf ), "%.2f%%", tr_truncd( 99.999, 2 ) );
+    check( !strcmp( buf, "99.99%" ) );
+
     /* base64 */
     out = tr_base64_encode( "YOYO!", -1, &len );
     check( out );