diff --git a/ext/phar/tar.c b/ext/phar/tar.c
index 17e09ae4cff..0b1de03c33f 100644
--- a/ext/phar/tar.c
+++ b/ext/phar/tar.c
@@ -19,7 +19,7 @@
 
 #include "phar_internal.h"
 
-static uint32_t phar_tar_number(char *buf, size_t len) /* {{{ */
+static uint32_t phar_tar_number(const char *buf, size_t len) /* {{{ */
 {
 	uint32_t num = 0;
 	size_t i = 0;
diff --git a/ext/phar/zip.c b/ext/phar/zip.c
index db45a0c576e..f7d927b62a3 100644
--- a/ext/phar/zip.c
+++ b/ext/phar/zip.c
@@ -150,7 +150,7 @@ static int phar_zip_process_extra(php_stream *fp, phar_entry_info *entry, uint16
   OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
   IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
-static time_t phar_zip_d2u_time(char *cdtime, char *cddate) /* {{{ */
+static time_t phar_zip_d2u_time(const char *cdtime, const char *cddate) /* {{{ */
 {
 	int dtime = PHAR_GET_16(cdtime), ddate = PHAR_GET_16(cddate);
 	struct tm *tm, tmbuf;