diff --git a/jerry-math/log1p.c b/jerry-math/log1p.c
index c76631c507..6d723b2245 100644
--- a/jerry-math/log1p.c
+++ b/jerry-math/log1p.c
@@ -121,7 +121,7 @@ log1p (double x)
       /* x <= -1.0 */
       if (x == -1.0)
       {
-        /* log1p(-1) = +inf */
+        /* log1p(-1) = -inf */
         return -two54 / zero;
       }
       else