diff --git a/library/math_sqrt.c b/library/math_sqrt.c
index a31f03e7..a0b944f7 100644
--- a/library/math_sqrt.c
+++ b/library/math_sqrt.c
@@ -251,7 +251,7 @@ sqrt(double x)
 	}
 	else
 	{
-		result = 0;
+		result = NAN;
 		__set_errno(EDOM);
 	}