diff --git a/src/functional/snprintf.c b/src/functional/snprintf.c
index 2c94d02..600cd11 100644
--- a/src/functional/snprintf.c
+++ b/src/functional/snprintf.c
@@ -86,7 +86,8 @@ static const struct {
 	{ "%f", 1.3, "1.300000" },
 	{ "%f", 1.4, "1.400000" },
 	{ "%f", 1.5, "1.500000" },
-	{ "%.4f", 1.06125, "1.0612" },
+	{ "%.4f", 1.06125, "1.0613" }, /* input is not representible exactly as double */
+	{ "%.4f", 1.03125, "1.0312" }, /* 0x1.08p0 */
 	{ "%.2f", 1.375, "1.38" },
 	{ "%.1f", 1.375, "1.4" },
 	{ "%.1lf", 1.375, "1.4" },