diff --git a/Objects/stringobject.c b/Objects/stringobject.c
index 3870343..504b119 100644
--- a/Objects/stringobject.c
+++ b/Objects/stringobject.c
@@ -4198,7 +4198,8 @@
 	   always given), therefore increase the length by one.
 
 	*/
-	if ((type == 'g' && buflen <= (size_t)10 + (size_t)prec) ||
+	if (((type == 'g' || type == 'G') &&
+              buflen <= (size_t)10 + (size_t)prec) ||
 	    (type == 'f' && buflen <= (size_t)53 + (size_t)prec)) {
 		PyErr_SetString(PyExc_OverflowError,
 			"formatted float is too long (precision too large?)");