diff --git a/btrfsck.c b/btrfsck.c

index 63e44d1..1e040c4 100644

--- a/btrfsck.c

+++ b/btrfsck.c

@@ -22,7 +22,9 @@

 #include <stdlib.h>

 #include <unistd.h>

 #include <fcntl.h>

+#include <sys/types.h>

 #include <sys/stat.h>

+#include <unistd.h>

 #include "kerncompat.h"

 #include "ctree.h"

 #include "disk-io.h"

diff --git a/mkfs.c b/mkfs.c

index 2e99b95..638f4c2 100644

--- a/mkfs.c

+++ b/mkfs.c

@@ -348,7 +348,7 @@ int main(int ac, char **av)

 	u64 alloc_start = 0;

 	u64 metadata_profile = BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;

 	u64 data_profile = BTRFS_BLOCK_GROUP_RAID0;

-	u32 leafsize = getpagesize();

+	u32 leafsize = sysconf(_SC_PAGESIZE);

 	u32 sectorsize = 4096;

 	u32 nodesize = leafsize;

 	u32 stripesize = 4096;

@@ -405,7 +405,7 @@ int main(int ac, char **av)

 				print_usage();

 		}

 	}

-	sectorsize = max(sectorsize, (u32)getpagesize());

+	sectorsize = max(sectorsize, (u32)sysconf(_SC_PAGESIZE));

 	if (leafsize < sectorsize || (leafsize & (sectorsize - 1))) {

 		fprintf(stderr, "Illegal leafsize %u\n", leafsize);

 		exit(1);