diff --git a/core/modules/filters/prefix.js b/core/modules/filters/prefix.js
index 470dbfd1a..49bb8110f 100644
--- a/core/modules/filters/prefix.js
+++ b/core/modules/filters/prefix.js
@@ -19,13 +19,13 @@ exports.prefix = function(source,operator,options) {
 	var results = [];
 	if(operator.prefix === "!") {
 		source(function(tiddler,title) {
-			if(title.substr(0,operator.operand.length).toLowerCase() !== operator.operand.toLowerCase()) {
+			if(title.substr(0,operator.operand.length) !== operator.operand) {
 				results.push(title);
 			}
 		});
 	} else {
 		source(function(tiddler,title) {
-			if(title.substr(0,operator.operand.length).toLowerCase() === operator.operand.toLowerCase()) {
+			if(title.substr(0,operator.operand.length) === operator.operand) {
 				results.push(title);
 			}
 		});
diff --git a/core/modules/filters/removeprefix.js b/core/modules/filters/removeprefix.js
index b7f5c5cf4..3e93dcd00 100644
--- a/core/modules/filters/removeprefix.js
+++ b/core/modules/filters/removeprefix.js
@@ -18,7 +18,7 @@ Export our filter function
 exports.removeprefix = function(source,operator,options) {
 	var results = [];
 	source(function(tiddler,title) {
-		if(title.substr(0,operator.operand.length).toLowerCase() === operator.operand.toLowerCase()) {
+		if(title.substr(0,operator.operand.length) === operator.operand) {
 			results.push(title.substr(operator.operand.length));
 		}
 	});
diff --git a/core/modules/filters/removesuffix.js b/core/modules/filters/removesuffix.js
index 4256fe49f..0dac6e598 100644
--- a/core/modules/filters/removesuffix.js
+++ b/core/modules/filters/removesuffix.js
@@ -18,7 +18,7 @@ Export our filter function
 exports.removesuffix = function(source,operator,options) {
 	var results = [];
 	source(function(tiddler,title) {
-		if(title.substr(-operator.operand.length).toLowerCase() === operator.operand.toLowerCase()) {
+		if(title.substr(-operator.operand.length) === operator.operand) {
 			results.push(title.substr(0,title.length - operator.operand.length));
 		}
 	});
diff --git a/core/modules/filters/suffix.js b/core/modules/filters/suffix.js
index 45e8900c4..a93733cc8 100644
--- a/core/modules/filters/suffix.js
+++ b/core/modules/filters/suffix.js
@@ -19,13 +19,13 @@ exports.suffix = function(source,operator,options) {
 	var results = [];
 	if(operator.prefix === "!") {
 		source(function(tiddler,title) {
-			if(title.substr(-operator.operand.length).toLowerCase() !== operator.operand.toLowerCase()) {
+			if(title.substr(-operator.operand.length) !== operator.operand) {
 				results.push(title);
 			}
 		});
 	} else {
 		source(function(tiddler,title) {
-			if(title.substr(-operator.operand.length).toLowerCase() === operator.operand.toLowerCase()) {
+			if(title.substr(-operator.operand.length) === operator.operand) {
 				results.push(title);
 			}
 		});