diff --git a/Objects/floatobject.c b/Objects/floatobject.c
index c7bdbed..60dcca9 100644
--- a/Objects/floatobject.c
+++ b/Objects/floatobject.c
@@ -136,7 +136,7 @@
 	for (; *cp != '\0'; cp++) {
 		/* Any non-digit means it's not an integer;
 		   this takes care of NAN and INF as well. */
-		if (!isdigit(*cp))
+		if (!isdigit(Py_CHARMASK(*cp)))
 			break;
 	}
 	if (*cp == '\0') {
@@ -330,10 +330,6 @@
 		}
 		return newfloatobject(0.0);
 	}
-	if (iv < 0.0) {
-		err_setstr(ValueError, "negative float to float power");
-		return NULL;
-	}
 	errno = 0;
 	ix = pow(iv, iw);
 	CHECK(ix);