diff --git a/src/text/ascii.rs b/src/text/ascii.rs
index 9f37738..9c81bb1 100644
--- a/src/text/ascii.rs
+++ b/src/text/ascii.rs
@@ -136,6 +136,11 @@ pub const TILDE: u8 = 0x7E; // ~
 // GROUP OF CHARACTERS
 // -- CRLF
 pub const CRLF: &[u8] = &[CR, LF];
+// -- CRCRLF
+// Sometimes portable libraries replace transparently
+// the "\n" with "\r\n" on Windows. When developpers
+// explicitly write "\r\n", the library generates "\r\r\n".
+pub const CRCRLF: &[u8] = &[CR, CR, LF];
 
 // -- WHITESPACE
 pub const WS: &[u8] = &[HT, SP];
diff --git a/src/text/whitespace.rs b/src/text/whitespace.rs
index 0e8650a..c48e347 100644
--- a/src/text/whitespace.rs
+++ b/src/text/whitespace.rs
@@ -22,7 +22,7 @@ use nom::{
 /// \r or \n is allowed nowhere else, so we also add this support.
 
 pub fn obs_crlf(input: &[u8]) -> IResult<&[u8], &[u8]> {
-    alt((tag(ascii::CRLF), tag(&[ascii::CR]), tag(&[ascii::LF])))(input)
+    alt((tag(ascii::CRLF), tag(ascii::CRCRLF), tag(&[ascii::CR]), tag(&[ascii::LF])))(input)
 }
 
 /// ```abnf