diff --git a/programs/cmd_digest.c b/programs/cmd_digest.c
index 180f438..7899b04 100644
--- a/programs/cmd_digest.c
+++ b/programs/cmd_digest.c
@@ -90,7 +90,7 @@ int fsverity_cmd_digest(const struct fsverity_command *cmd,
 		tree_params.hash_algorithm = FS_VERITY_HASH_ALG_DEFAULT;
 
 	if (tree_params.block_size == 0)
-		tree_params.block_size = get_default_block_size();
+		tree_params.block_size = 4096;
 
 	for (int i = 0; i < argc; i++) {
 		struct fsverity_signed_digest *d = NULL;
diff --git a/programs/cmd_enable.c b/programs/cmd_enable.c
index d90d208..ba5b088 100644
--- a/programs/cmd_enable.c
+++ b/programs/cmd_enable.c
@@ -114,7 +114,7 @@ int fsverity_cmd_enable(const struct fsverity_command *cmd,
 		arg.hash_algorithm = FS_VERITY_HASH_ALG_DEFAULT;
 
 	if (arg.block_size == 0)
-		arg.block_size = get_default_block_size();
+		arg.block_size = 4096;
 
 	if (!open_file(&file, argv[0], O_RDONLY, 0))
 		goto out_err;
diff --git a/programs/cmd_sign.c b/programs/cmd_sign.c
index 580e4df..9cb7507 100644
--- a/programs/cmd_sign.c
+++ b/programs/cmd_sign.c
@@ -105,7 +105,7 @@ int fsverity_cmd_sign(const struct fsverity_command *cmd,
 		tree_params.hash_algorithm = FS_VERITY_HASH_ALG_DEFAULT;
 
 	if (tree_params.block_size == 0)
-		tree_params.block_size = get_default_block_size();
+		tree_params.block_size = 4096;
 
 	if (sig_params.keyfile == NULL) {
 		error_msg("Missing --key argument");
diff --git a/programs/fsverity.c b/programs/fsverity.c
index 4a2f8df..33d0a3f 100644
--- a/programs/fsverity.c
+++ b/programs/fsverity.c
@@ -12,7 +12,6 @@
 #include "fsverity.h"
 
 #include <limits.h>
-#include <unistd.h>
 
 static const struct fsverity_command {
 	const char *name;
@@ -192,19 +191,6 @@ bool parse_salt_option(const char *arg, u8 **salt_ptr, u32 *salt_size_ptr)
 	return true;
 }
 
-u32 get_default_block_size(void)
-{
-	long n = sysconf(_SC_PAGESIZE);
-
-	if (n <= 0 || n >= INT_MAX || !is_power_of_2(n)) {
-		fprintf(stderr,
-			"Warning: invalid _SC_PAGESIZE (%ld).  Assuming 4K blocks.\n",
-			n);
-		return 4096;
-	}
-	return n;
-}
-
 int main(int argc, char *argv[])
 {
 	const struct fsverity_command *cmd;
diff --git a/programs/fsverity.h b/programs/fsverity.h
index 669fef2..2af5527 100644
--- a/programs/fsverity.h
+++ b/programs/fsverity.h
@@ -46,6 +46,5 @@ void usage(const struct fsverity_command *cmd, FILE *fp);
 bool parse_hash_alg_option(const char *arg, u32 *alg_ptr);
 bool parse_block_size_option(const char *arg, u32 *size_ptr);
 bool parse_salt_option(const char *arg, u8 **salt_ptr, u32 *salt_size_ptr);
-u32 get_default_block_size(void);
 
 #endif /* PROGRAMS_FSVERITY_H */