diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 72bfb83..70c95a1 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -8228,7 +8228,7 @@
         return -1;
     if (prec < 0)
         prec = 6;
-    if (type == 'f' && (fabs(x) / 1e25) >= 1e25)
+    if (type == 'f' && fabs(x) >= 1e50)
         type = 'g';
     /* Worst case length calc to ensure no buffer overrun: