diff --git a/Modules/timemodule.c b/Modules/timemodule.c
index 51f472e..397cf8c 100644
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -487,7 +487,7 @@
         if (outbuf[1]=='#')
             ++outbuf; /* not documented by python, */
         if (outbuf[1]=='\0' ||
-            !strchr("aAbBcdfHIjmMpSUwWxXyYzZ%", outbuf[1]))
+            !strchr("aAbBcdHIjmMpSUwWxXyYzZ%", outbuf[1]))
         {
             PyErr_SetString(PyExc_ValueError, "Invalid format string");
             return 0;