diff --git a/include/sysemu/os-win32.h b/include/sysemu/os-win32.h
index 13dcef6b4c..400e098607 100644
--- a/include/sysemu/os-win32.h
+++ b/include/sysemu/os-win32.h
@@ -87,7 +87,7 @@ static inline void os_setup_post(void) {}
 void os_set_line_buffering(void);
 static inline void os_set_proc_name(const char *dummy) {}
 
-size_t getpagesize(void);
+int getpagesize(void);
 
 #if !defined(EPROTONOSUPPORT)
 # define EPROTONOSUPPORT EINVAL
diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index 09f9e98a40..6a47019dfb 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -454,7 +454,7 @@ gint g_poll(GPollFD *fds, guint nfds, gint timeout)
     return retval;
 }
 
-size_t getpagesize(void)
+int getpagesize(void)
 {
     SYSTEM_INFO system_info;