diff --git a/Modules/readline.c b/Modules/readline.c
index ff7075c6822e27..671a8b40aaf2eb 100644
--- a/Modules/readline.c
+++ b/Modules/readline.c
@@ -1013,9 +1013,9 @@ on_hook(PyObject *func)
 
 static int
 #if defined(_RL_FUNCTION_TYPEDEF)
-on_startup_hook(void)
+on_startup_hook(const char *, int)
 #else
-on_startup_hook(void)
+on_startup_hook(const char *, int)
 #endif
 {
     int r;
@@ -1028,9 +1028,9 @@ on_startup_hook(void)
 #ifdef HAVE_RL_PRE_INPUT_HOOK
 static int
 #if defined(_RL_FUNCTION_TYPEDEF)
-on_pre_input_hook(void)
+on_pre_input_hook(const char *, int)
 #else
-on_pre_input_hook(void)
+on_pre_input_hook(const char *, int)
 #endif
 {
     int r;