diff --git a/Objects/stringlib/formatter.h b/Objects/stringlib/formatter.h
index 122abe6..b75755e 100644
--- a/Objects/stringlib/formatter.h
+++ b/Objects/stringlib/formatter.h
@@ -789,6 +789,7 @@
         x = PyLong_AsLong(value);
         if (x == -1 && PyErr_Occurred())
             goto done;
+#if STRINGLIB_IS_UNICODE
 #ifdef Py_UNICODE_WIDE
         if (x < 0 || x > 0x10ffff) {
             PyErr_SetString(PyExc_OverflowError,
@@ -804,6 +805,13 @@
             goto done;
         }
 #endif
+#else
+        if (x < 0 || x > 0xff) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "%c arg not in range(0x100)");
+            goto done;
+        }
+#endif
         numeric_char = (STRINGLIB_CHAR)x;
         pnumeric_chars = &numeric_char;
         n_digits = 1;