diff --git a/src/Cleave.js b/src/Cleave.js
index dcd8a125..1e488f96 100644
--- a/src/Cleave.js
+++ b/src/Cleave.js
@@ -277,7 +277,7 @@ Cleave.prototype = {
         value = Util.stripDelimiters(value, pps.delimiter, pps.delimiters);
 
         // strip prefix
-        value = Util.getPrefixStrippedValue(value, pps.prefix, pps.prefixLength, pps.result, pps.delimiter, pps.delimiters, pps.noImmediatePrefix, pps.tailPrefix);
+        value = Util.getPrefixStrippedValue(value, pps.prefix, pps.prefixLength, pps.result, pps.delimiter, pps.delimiters, pps.noImmediatePrefix, pps.tailPrefix, pps.signBeforePrefix);
 
         // strip non-numeric characters
         value = pps.numericOnly ? Util.strip(value, /[^\d]/g) : value;
@@ -421,7 +421,7 @@ Cleave.prototype = {
             rawValue = owner.element.value;
 
         if (pps.rawValueTrimPrefix) {
-            rawValue = Util.getPrefixStrippedValue(rawValue, pps.prefix, pps.prefixLength, pps.result, pps.delimiter, pps.delimiters, pps.noImmediatePrefix, pps.tailPrefix);
+            rawValue = Util.getPrefixStrippedValue(rawValue, pps.prefix, pps.prefixLength, pps.result, pps.delimiter, pps.delimiters, pps.noImmediatePrefix, pps.tailPrefix, pps.signBeforePrefix);
         }
 
         if (pps.numeral) {
diff --git a/src/Cleave.react.js b/src/Cleave.react.js
index 6cb2de9c..f65d9441 100644
--- a/src/Cleave.react.js
+++ b/src/Cleave.react.js
@@ -207,7 +207,7 @@ var cleaveReactClass = CreateReactClass({
             rawValue = pps.result;
 
         if (pps.rawValueTrimPrefix) {
-            rawValue = Util.getPrefixStrippedValue(rawValue, pps.prefix, pps.prefixLength, pps.result, pps.delimiter, pps.delimiters, pps.noImmediatePrefix, pps.tailPrefix);
+            rawValue = Util.getPrefixStrippedValue(rawValue, pps.prefix, pps.prefixLength, pps.result, pps.delimiter, pps.delimiters, pps.noImmediatePrefix, pps.tailPrefix, pps.signBeforePrefix);
         }
 
         if (pps.numeral) {
@@ -346,7 +346,7 @@ var cleaveReactClass = CreateReactClass({
         value = Util.stripDelimiters(value, pps.delimiter, pps.delimiters);
 
         // strip prefix
-        value = Util.getPrefixStrippedValue(value, pps.prefix, pps.prefixLength, pps.result, pps.delimiter, pps.delimiters, pps.noImmediatePrefix, pps.tailPrefix);
+        value = Util.getPrefixStrippedValue(value, pps.prefix, pps.prefixLength, pps.result, pps.delimiter, pps.delimiters, pps.noImmediatePrefix, pps.tailPrefix, pps.signBeforePrefix);
 
         // strip non-numeric characters
         value = pps.numericOnly ? Util.strip(value, /[^\d]/g) : value;
diff --git a/src/utils/Util.js b/src/utils/Util.js
index 20c63ba9..0ea32df1 100644
--- a/src/utils/Util.js
+++ b/src/utils/Util.js
@@ -85,12 +85,17 @@ var Util = {
     // PREFIX-123   |   PEFIX-123     |     123
     // PREFIX-123   |   PREFIX-23     |     23
     // PREFIX-123   |   PREFIX-1234   |     1234
-    getPrefixStrippedValue: function (value, prefix, prefixLength, prevResult, delimiter, delimiters, noImmediatePrefix, tailPrefix) {
+    getPrefixStrippedValue: function (value, prefix, prefixLength, prevResult, delimiter, delimiters, noImmediatePrefix, tailPrefix, signBeforePrefix) {
         // No prefix
         if (prefixLength === 0) {
           return value;
         }
 
+        if (signBeforePrefix && (value.slice(0, 1) == '-')) {
+            var prev = (prevResult.slice(0, 1) == '-') ? prevResult.slice(1) : prevResult;
+            return '-' + this.getPrefixStrippedValue(value.slice(1), prefix, prefixLength, prev, delimiter, delimiters, noImmediatePrefix, tailPrefix, signBeforePrefix);
+        }
+
         // Pre result prefix string does not match pre-defined prefix
         if (prevResult.slice(0, prefixLength) !== prefix && !tailPrefix) {
             // Check if the first time user entered something
diff --git a/test/fixtures/util.json b/test/fixtures/util.json
index 531caa8d..5603f8ae 100644
--- a/test/fixtures/util.json
+++ b/test/fixtures/util.json
@@ -176,6 +176,20 @@
         []
       ],
       "expected": "12"
+    },
+    {
+      "params": [
+        "-test123",
+        "test",
+        4,
+        "-test123",
+        "-",
+        [],
+        false,
+        false,
+        true
+      ],
+      "expected":  "-123"
     }
   ]
 }
diff --git a/test/unit/Util_spec.js b/test/unit/Util_spec.js
index 6f62ff19..91ae1311 100644
--- a/test/unit/Util_spec.js
+++ b/test/unit/Util_spec.js
@@ -25,7 +25,7 @@ describe('Util', function () {
         _.each(json.getPrefixStrippedValue, function (data) {
             var params = data.params;
             it('should get prefix stripped value for: ' + params[0] + ' as: ' + data.expected, function () {
-                Util.getPrefixStrippedValue(params[0], params[1], params[2], params[3], params[4], params[5], params[6]).should.eql(data.expected);
+                Util.getPrefixStrippedValue(params[0], params[1], params[2], params[3], params[4], params[5], params[6], params[7], params[8]).should.eql(data.expected);
             });
         });
     });