diff --git a/winsup/cygwin/math/sqrt.def.h b/winsup/cygwin/math/sqrt.def.h
index 1048130d0..2690d1d9f 100644
--- a/winsup/cygwin/math/sqrt.def.h
+++ b/winsup/cygwin/math/sqrt.def.h
@@ -73,9 +73,8 @@ __FLT_ABI (sqrt) (__FLT_TYPE x)
       if (x_class == FP_ZERO)
 	return __FLT_CST (-0.0);
 
-      res = (signbit (x) ? -__FLT_NAN : __FLT_NAN);
-      __FLT_RPT_DOMAIN ("sqrt", x, 0.0, res);
-      return res;
+      __FLT_RPT_DOMAIN ("sqrt", x, 0.0, x);
+      return x;
     }
   else if (x_class == FP_ZERO)
     return __FLT_CST (0.0);