--- mount/swapon.c
+++ mount/swapon.c
@@ -50,6 +50,9 @@
 
 #define QUIET	1
 
+#undef PAGE_SIZE
+#define PAGE_SIZE sysconf(_SC_PAGESIZE)
+
 int all = 0;
 int verbose = 0;
 int priority = -1;	/* non-prioritized swap by default */