diff --git a/src/stdlib/SDL_malloc.c b/src/stdlib/SDL_malloc.c
index 6d174057df..24c8f51b58 100644
--- a/src/stdlib/SDL_malloc.c
+++ b/src/stdlib/SDL_malloc.c
@@ -1590,7 +1590,7 @@ unsigned char _BitScanReverse(unsigned long *index, unsigned long mask);
 #    define malloc_getpagesize sysconf(_SC_PAGE_SIZE)
 #  else
 #    if defined(BSD) || defined(DGUX) || defined(HAVE_GETPAGESIZE)
-       extern size_t getpagesize();
+       extern int getpagesize();
 #      define malloc_getpagesize getpagesize()
 #    else
 #      ifdef WIN32 /* use supplied emulation of getpagesize */