diff --git a/src/timezone/tznames/Asia.txt b/src/timezone/tznames/Asia.txt
index 3493e0d..483d314 100644
--- a/src/timezone/tznames/Asia.txt
+++ b/src/timezone/tznames/Asia.txt
@@ -202,6 +202,7 @@ PETT    43200    # Petropavlovsk-Kamchatski Time
                  #     (Asia/Kamchatka)
 PHT     28800    # Phillipine Time (not in zic)
 PKT     18000    # Pakistan Time (not in zic)
+PKST    21600 D  # Pakistan Summer Time (not in zic)
 QYZT    21600    # Kizilorda Time
                  #     (Asia/Qyzylorda)
 SAKST   39600 D  # Sakhalin Summer Time
diff --git a/src/timezone/tznames/Default b/src/timezone/tznames/Default
index 522eedd..f57673e 100644
--- a/src/timezone/tznames/Default
+++ b/src/timezone/tznames/Default
@@ -335,6 +335,7 @@ PETT    43200    # Petropavlovsk-Kamchatski Time
                  #     (Asia/Kamchatka)
 PHT     28800    # Phillipine Time (not in zic)
 PKT     18000    # Pakistan Time (not in zic)
+PKST    21600 D  # Pakistan Summer Time (not in zic)
 SGT     28800    # Singapore Time
                  #     (Asia/Singapore)
 TJT     18000    # Tajikistan Time