diff --git a/bits/40_harb.js b/bits/40_harb.js
index 8a619b6..ef00fb4 100644
--- a/bits/40_harb.js
+++ b/bits/40_harb.js
@@ -813,7 +813,17 @@ var PRN = (function() {
 		var ws/*:Worksheet*/ = o.dense ? ([]/*:any*/) : ({}/*:any*/);
 		var range/*:Range*/ = ({s: {c:0, r:0}, e: {c:0, r:0}}/*:any*/);
 
-		if(str.slice(0,4) == "sep=" && str.charCodeAt(5) == 10) { sep = str.charAt(4); str = str.slice(6); }
+		if(str.slice(0,4) == "sep=") {
+			// If the line ends in \r\n
+			if(str.charCodeAt(5) == 13 && str.charCodeAt(6) == 10 ) {
+				sep = str.charAt(4); str = str.slice(7);
+			}
+			// If line ends in \r OR \n
+			else if(str.charCodeAt(5) == 13 || str.charCodeAt(5) == 10 ) {
+				// 
+				sep = str.charAt(4); str = str.slice(6);
+			}
+		}
 		else sep = guess_sep(str.slice(0,1024));
 		var R = 0, C = 0, v = 0;
 		var start = 0, end = 0, sepcc = sep.charCodeAt(0), instr = false, cc=0;
diff --git a/xlsx.flow.js b/xlsx.flow.js
index f2d2232..c504734 100644
--- a/xlsx.flow.js
+++ b/xlsx.flow.js
@@ -7672,7 +7672,17 @@ var PRN = (function() {
 		var ws/*:Worksheet*/ = o.dense ? ([]/*:any*/) : ({}/*:any*/);
 		var range/*:Range*/ = ({s: {c:0, r:0}, e: {c:0, r:0}}/*:any*/);
 
-		if(str.slice(0,4) == "sep=" && str.charCodeAt(5) == 10) { sep = str.charAt(4); str = str.slice(6); }
+		if(str.slice(0,4) == "sep=") {
+			// If the line ends in \r\n
+			if(str.charCodeAt(5) == 13 && str.charCodeAt(6) == 10 ) {
+				sep = str.charAt(4); str = str.slice(7);
+			}
+			// If line ends in \r OR \n
+			else if(str.charCodeAt(5) == 13 || str.charCodeAt(5) == 10 ) {
+				// 
+				sep = str.charAt(4); str = str.slice(6);
+			}
+		}
 		else sep = guess_sep(str.slice(0,1024));
 		var R = 0, C = 0, v = 0;
 		var start = 0, end = 0, sepcc = sep.charCodeAt(0), instr = false, cc=0;
diff --git a/xlsx.js b/xlsx.js
index 957ebec..b491dd3 100644
--- a/xlsx.js
+++ b/xlsx.js
@@ -7574,7 +7574,17 @@ var PRN = (function() {
 		var ws = o.dense ? ([]) : ({});
 		var range = ({s: {c:0, r:0}, e: {c:0, r:0}});
 
-		if(str.slice(0,4) == "sep=" && str.charCodeAt(5) == 10) { sep = str.charAt(4); str = str.slice(6); }
+		if(str.slice(0,4) == "sep=") {
+			// If the line ends in \r\n
+			if(str.charCodeAt(5) == 13 && str.charCodeAt(6) == 10 ) {
+				sep = str.charAt(4); str = str.slice(7);
+			}
+			// If line ends in \r OR \n
+			else if(str.charCodeAt(5) == 13 || str.charCodeAt(5) == 10 ) {
+				// 
+				sep = str.charAt(4); str = str.slice(6);
+			}
+		}
 		else sep = guess_sep(str.slice(0,1024));
 		var R = 0, C = 0, v = 0;
 		var start = 0, end = 0, sepcc = sep.charCodeAt(0), instr = false, cc=0;