diff --git a/content/buffers.js b/content/buffers.js
index 958ac412..1d423fde 100644
--- a/content/buffers.js
+++ b/content/buffers.js
@@ -402,7 +402,7 @@ vimperator.Buffer = function() //{{{
 
         var match;
         if (match = buffer.match(/^(\d+):?/))
-            return vimperator.tabs.select(parseInt(match[1]) - 1, false); // make it zero-based
+            return vimperator.tabs.select(parseInt(match[1], 10) - 1, false); // make it zero-based
 
         var matches = [];
         var lower_buffer = buffer.toLowerCase();
diff --git a/content/commands.js b/content/commands.js
index 462a56d6..a53d858e 100644
--- a/content/commands.js
+++ b/content/commands.js
@@ -207,7 +207,7 @@ vimperator.Commands = function() //{{{
 
         // parse count
         if (matches[0])
-            matches[0] = parseInt(matches[0]);
+            matches[0] = parseInt(matches[0], 10);
         else
             matches[0] = -1;
 
@@ -1301,7 +1301,7 @@ vimperator.Commands = function() //{{{
                 }
                 else if (type == "number")
                 {
-                    var num = parseInt(val, 10);
+                    var num = parseInt(val);
                     if (isNaN(num))
                         vimperator.echoerr("E521: Number required after =: " + option.name + "=" + val);
                     else
@@ -1483,7 +1483,7 @@ vimperator.Commands = function() //{{{
             }
             else if (/^\d+$/.test(args))
             {
-                var index = parseInt(args) - 1;
+                var index = parseInt(args, 10) - 1;
                 if (index < vimperator.tabs.count())
                     vimperator.tabs.select(index, true);
                 else
diff --git a/content/tabs.js b/content/tabs.js
index f2a85ead..8016fb8a 100644
--- a/content/tabs.js
+++ b/content/tabs.js
@@ -67,9 +67,9 @@ vimperator.Tabs = function() //{{{
         else
         {
             if (spec.match(/^([+-]\d+)$/)) // relative position +/-N
-                position += parseInt(spec);
+                position += parseInt(spec, 10);
             else                           // absolute position
-                position = parseInt(spec);
+                position = parseInt(spec, 10);
         }
 
         if (position > last)
diff --git a/content/ui.js b/content/ui.js
index a7ff62d0..c7f4414b 100644
--- a/content/ui.js
+++ b/content/ui.js
@@ -708,7 +708,7 @@ vimperator.CommandLine = function() //{{{
             case "<LeftMouse>":
                 if (event.originalTarget.className == "hl-URL buffer-list")
                 {
-                    vimperator.tabs.select(parseInt(event.originalTarget.parentNode.parentNode.firstChild.textContent) - 1);
+                    vimperator.tabs.select(parseInt(event.originalTarget.parentNode.parentNode.firstChild.textContent, 10) - 1);
                     close_window = true;
                     break;
                 }
diff --git a/content/vimperator.js b/content/vimperator.js
index 27f94a28..25e86a95 100644
--- a/content/vimperator.js
+++ b/content/vimperator.js
@@ -311,7 +311,7 @@ const vimperator = (function() //{{{
             // Number
             else if (match = string.match(/^(\d+)$/))
             {
-                return parseInt(match[1]);
+                return parseInt(match[1], 10);
             }
 
             var reference = this.variableReference(string);