diff --git a/src/httpdate.rs b/src/httpdate.rs
index 1b27379..0fb7741 100644
--- a/src/httpdate.rs
+++ b/src/httpdate.rs
@@ -178,7 +178,7 @@ impl Display for HttpDate {
             2 => b"Feb",
             3 => b"Mar",
             4 => b"Apr",
-            5 => b"Mai",
+            5 => b"May",
             6 => b"Jun",
             7 => b"Jul",
             8 => b"Aug",
@@ -253,7 +253,7 @@ fn parse_imf_fixdate(s: &[u8]) -> Result<HttpDate, Error> {
             b" Feb " => 2,
             b" Mar " => 3,
             b" Apr " => 4,
-            b" Mai " => 5,
+            b" May " => 5,
             b" Jun " => 6,
             b" Jul " => 7,
             b" Aug " => 8,
@@ -316,7 +316,7 @@ fn parse_rfc850_date(s: &[u8]) -> Result<HttpDate, Error> {
             b"-Feb-" => 2,
             b"-Mar-" => 3,
             b"-Apr-" => 4,
-            b"-Mai-" => 5,
+            b"-May-" => 5,
             b"-Jun-" => 6,
             b"-Jul-" => 7,
             b"-Aug-" => 8,
@@ -354,7 +354,7 @@ fn parse_asctime(s: &[u8]) -> Result<HttpDate, Error> {
             b"Feb " => 2,
             b"Mar " => 3,
             b"Apr " => 4,
-            b"Mai " => 5,
+            b"May " => 5,
             b"Jun " => 6,
             b"Jul " => 7,
             b"Aug " => 8,