Index: src/loadext.c
==================================================================
--- src/loadext.c
+++ src/loadext.c
@@ -674,11 +674,11 @@
 /*
 ** Register a statically linked extension that is automatically
 ** loaded by every new database connection.
 */
 int sqlite3_auto_extension(
-  void (*xInit)(sqlite3 *, char **, const sqlite3_api_routines *)
+  int (*xInit)(sqlite3 *, char **, const sqlite3_api_routines *)
 ){
   int rc = SQLITE_OK;
 #ifndef SQLITE_OMIT_AUTOINIT
   rc = sqlite3_initialize();
   if( rc ){
@@ -721,11 +721,11 @@
 **
 ** Return 1 if xInit was found on the list and removed.  Return 0 if xInit
 ** was not on the list.
 */
 int sqlite3_cancel_auto_extension(
-  void (*xInit)(sqlite3 *, char **, const sqlite3_api_routines *)
+  int (*xInit)(sqlite3 *, char **, const sqlite3_api_routines *)
 ){
 #if SQLITE_THREADSAFE
   sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
 #endif
   int i;

Index: src/sqlite.h.in
==================================================================
--- src/sqlite.h.in
+++ src/sqlite.h.in
@@ -5707,11 +5707,11 @@
 ** See also: [sqlite3_reset_auto_extension()]
 ** and [sqlite3_cancel_auto_extension()]
 */
 typedef struct sqlite3_api_routines sqlite3_api_routines;
 int sqlite3_auto_extension(
-  void (*xEntryPoint)(sqlite3 *, char **, const sqlite3_api_routines *)
+  int (*xEntryPoint)(sqlite3 *, char **, const sqlite3_api_routines *)
 );
 
 /*
 ** CAPI3REF: Cancel Automatic Extension Loading
 **
@@ -5721,11 +5721,11 @@
 ** routine returns 1 if initialization routine X was successfully 
 ** unregistered and it returns 0 if X was not on the list of initialization
 ** routines.
 */
 int sqlite3_cancel_auto_extension(
-  void (*xEntryPoint)(sqlite3 *, char **, const sqlite3_api_routines *)
+  int (*xEntryPoint)(sqlite3 *, char **, const sqlite3_api_routines *)
 );
 
 /*
 ** CAPI3REF: Reset Automatic Extension Loading
 **

Index: src/sqlite3ext.h
==================================================================
--- src/sqlite3ext.h
+++ src/sqlite3ext.h
@@ -249,16 +249,16 @@
   sqlite3_int64 (*uri_int64)(const char*,const char*,sqlite3_int64);
   const char *(*uri_parameter)(const char*,const char*);
   char *(*vsnprintf)(int,char*,const char*,va_list);
   int (*wal_checkpoint_v2)(sqlite3*,const char*,int,int*,int*);
   /* Version 3.8.7 and later */
-  int (*auto_extension)(void(*)(sqlite3*,char**,const sqlite3_api_routines*));
+  int (*auto_extension)(int(*)(sqlite3*,char**,const sqlite3_api_routines*));
   int (*bind_blob64)(sqlite3_stmt*,int,const void*,sqlite3_uint64,
                      void(*)(void*));
   int (*bind_text64)(sqlite3_stmt*,int,const char*,sqlite3_uint64,
                       void(*)(void*),unsigned char);
-  int (*cancel_auto_extension)(void(*)(sqlite3*,char**,
+  int (*cancel_auto_extension)(int(*)(sqlite3*,char**,
                                        const sqlite3_api_routines*));
   int (*load_extension)(sqlite3*,const char*,const char*,char**);
   void *(*malloc64)(sqlite3_uint64);
   sqlite3_uint64 (*msize)(void*);
   void *(*realloc64)(void*,sqlite3_uint64);