diff --git a/Doc/c-api/veryhigh.rst b/Doc/c-api/veryhigh.rst
index 6256bf7a1454a9a..eefc6386597b395 100644
--- a/Doc/c-api/veryhigh.rst
+++ b/Doc/c-api/veryhigh.rst
@@ -151,6 +151,8 @@ the same library that the Python runtime is using.
    event loops, as done in :file:`Modules/_tkinter.c` in the
    Python source code.
 
+   This function should block until stdin is readable.
+
    .. versionchanged:: 3.12
       This function is only called from the
       :ref:`main interpreter <sub-interpreter-support>`.
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2026-06-29-00-00-00.gh-issue-103929.InputHook.rst b/Misc/NEWS.d/next/Core_and_Builtins/2026-06-29-00-00-00.gh-issue-103929.InputHook.rst
new file mode 100644
index 000000000000000..ebae4b74a2a6c2d
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2026-06-29-00-00-00.gh-issue-103929.InputHook.rst
@@ -0,0 +1 @@
+Fix repeated calls to :c:var:`PyOS_InputHook` for long input lines.
diff --git a/Parser/myreadline.c b/Parser/myreadline.c
index ee77479ba7bdccb..1504577ab11de2c 100644
--- a/Parser/myreadline.c
+++ b/Parser/myreadline.c
@@ -53,12 +53,6 @@ my_fgets(PyThreadState* tstate, char *buf, int len, FILE *fp)
 #endif
 
     while (1) {
-        if (PyOS_InputHook != NULL &&
-            // GH-104668: See PyOS_ReadlineFunctionPointer's comment below...
-            _Py_IsMainInterpreter(tstate->interp))
-        {
-            (void)(PyOS_InputHook)();
-        }
 
         errno = 0;
         clearerr(fp);
@@ -312,6 +306,13 @@ PyOS_StdioReadline(FILE *sys_stdin, FILE *sys_stdout, const char *prompt)
         fprintf(stderr, "%s", prompt);
     }
     fflush(stderr);
+    // Keep this outside my_fgets(): long lines call my_fgets() repeatedly.
+    if (PyOS_InputHook != NULL &&
+        // GH-104668: See PyOS_ReadlineFunctionPointer's comment below...
+        _Py_IsMainInterpreter(tstate->interp))
+    {
+        (void)(PyOS_InputHook)();
+    }
 
     n = 0;
     p = NULL;