diff --git a/apsw/__init__.pyi b/apsw/__init__.pyi
index a6e9d166..9bf2a1cd 100644
--- a/apsw/__init__.pyi
+++ b/apsw/__init__.pyi
@@ -3893,6 +3893,8 @@ SQLITE_IOCAP_SAFE_APPEND: int = 512
 """For `Device Characteristics <https://sqlite.org/c3ref/c_iocap_atomic.html>'__"""
 SQLITE_IOCAP_SEQUENTIAL: int = 1024
 """For `Device Characteristics <https://sqlite.org/c3ref/c_iocap_atomic.html>'__"""
+SQLITE_IOCAP_SUBPAGE_READ: int = 32768
+"""For `Device Characteristics <https://sqlite.org/c3ref/c_iocap_atomic.html>'__"""
 SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN: int = 2048
 """For `Device Characteristics <https://sqlite.org/c3ref/c_iocap_atomic.html>'__"""
 SQLITE_IOERR: int = 10
@@ -4315,7 +4317,8 @@ SQLITE_IOCAP_ATOMIC2K SQLITE_IOCAP_ATOMIC32K SQLITE_IOCAP_ATOMIC4K
 SQLITE_IOCAP_ATOMIC512 SQLITE_IOCAP_ATOMIC64K SQLITE_IOCAP_ATOMIC8K
 SQLITE_IOCAP_BATCH_ATOMIC SQLITE_IOCAP_IMMUTABLE
 SQLITE_IOCAP_POWERSAFE_OVERWRITE SQLITE_IOCAP_SAFE_APPEND
-SQLITE_IOCAP_SEQUENTIAL SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN"""
+SQLITE_IOCAP_SEQUENTIAL SQLITE_IOCAP_SUBPAGE_READ
+SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN"""
 
 mapping_extended_result_codes: dict[str | int, int | str]
 """Extended Result Codes mapping names to int and int to names.
diff --git a/src/constants.c b/src/constants.c
index df8b8ae5..af418082 100644
--- a/src/constants.c
+++ b/src/constants.c
@@ -222,7 +222,7 @@ add_apsw_constants(PyObject *module)
 
     /* Device Characteristics */
     the_dict = Py_BuildValue(
-        "{siissiissiissiissiissiissiissiissiissiissiissiissiissiissiis}",
+        "{siissiissiissiissiissiissiissiissiissiissiissiissiissiissiissiis}",
         "SQLITE_IOCAP_ATOMIC", SQLITE_IOCAP_ATOMIC, SQLITE_IOCAP_ATOMIC, "SQLITE_IOCAP_ATOMIC",
         "SQLITE_IOCAP_ATOMIC16K", SQLITE_IOCAP_ATOMIC16K, SQLITE_IOCAP_ATOMIC16K, "SQLITE_IOCAP_ATOMIC16K",
         "SQLITE_IOCAP_ATOMIC1K", SQLITE_IOCAP_ATOMIC1K, SQLITE_IOCAP_ATOMIC1K, "SQLITE_IOCAP_ATOMIC1K",
@@ -237,6 +237,7 @@ add_apsw_constants(PyObject *module)
         "SQLITE_IOCAP_POWERSAFE_OVERWRITE", SQLITE_IOCAP_POWERSAFE_OVERWRITE, SQLITE_IOCAP_POWERSAFE_OVERWRITE, "SQLITE_IOCAP_POWERSAFE_OVERWRITE",
         "SQLITE_IOCAP_SAFE_APPEND", SQLITE_IOCAP_SAFE_APPEND, SQLITE_IOCAP_SAFE_APPEND, "SQLITE_IOCAP_SAFE_APPEND",
         "SQLITE_IOCAP_SEQUENTIAL", SQLITE_IOCAP_SEQUENTIAL, SQLITE_IOCAP_SEQUENTIAL, "SQLITE_IOCAP_SEQUENTIAL",
+        "SQLITE_IOCAP_SUBPAGE_READ", SQLITE_IOCAP_SUBPAGE_READ, SQLITE_IOCAP_SUBPAGE_READ, "SQLITE_IOCAP_SUBPAGE_READ",
         "SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN", SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN, SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN, "SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN");
     if (!the_dict)
     {
@@ -1046,6 +1047,7 @@ add_apsw_constants(PyObject *module)
         || PyModule_AddIntConstant(module, "SQLITE_IOCAP_POWERSAFE_OVERWRITE", SQLITE_IOCAP_POWERSAFE_OVERWRITE)
         || PyModule_AddIntConstant(module, "SQLITE_IOCAP_SAFE_APPEND", SQLITE_IOCAP_SAFE_APPEND)
         || PyModule_AddIntConstant(module, "SQLITE_IOCAP_SEQUENTIAL", SQLITE_IOCAP_SEQUENTIAL)
+        || PyModule_AddIntConstant(module, "SQLITE_IOCAP_SUBPAGE_READ", SQLITE_IOCAP_SUBPAGE_READ)
         || PyModule_AddIntConstant(module, "SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN", SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN)
         || PyModule_AddIntConstant(module, "SQLITE_IOERR", SQLITE_IOERR)
         || PyModule_AddIntConstant(module, "SQLITE_IOERR_ACCESS", SQLITE_IOERR_ACCESS)