diff --git a/content/buffers.js b/content/buffers.js
index b541af67..38f74cee 100644
--- a/content/buffers.js
+++ b/content/buffers.js
@@ -448,7 +448,7 @@ 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 0670079c..24e25edb 100644
--- a/content/commands.js
+++ b/content/commands.js
@@ -363,7 +363,7 @@ vimperator.Commands = function() //{{{
                                 }
                                 break;
                             case OPTION_INT:
-                                arg = parseInt(arg);
+                                arg = parseInt(arg, 10);
                                 if (isNaN(arg))
                                 {
                                     vimperator.echoerr("Numeric argument required for integer option: " + optname);
@@ -499,7 +499,7 @@ vimperator.Commands = function() //{{{
 
         // parse count
         if (matches[0])
-            matches[0] = parseInt(matches[0]);
+            matches[0] = parseInt(matches[0], 10);
         else
             matches[0] = -1;
 
@@ -1812,7 +1812,7 @@ vimperator.Commands = function() //{{{
             }
             else if (/^\d+$/.test(args))
             {
-                var index = parseInt(args) - 1;
+                var index = parseInt(args, 10) - 1;
                 if (index < vimperator.tabs.count())
                     vimperator.tabs.select(index, true);
                 else
@@ -2150,14 +2150,14 @@ vimperator.Commands = function() //{{{
             }
             else if (/^\d+$/.test(args))
             {
-                level = parseInt(args);
+                level = parseInt(args, 10);
             }
             else if (/^[+-]\d+$/.test(args))
             {
                 if (special)
-                    level = vimperator.buffer.fullZoom + parseInt(args);
+                    level = vimperator.buffer.fullZoom + parseInt(args, 10);
                 else
-                    level = vimperator.buffer.textZoom + parseInt(args);
+                    level = vimperator.buffer.textZoom + parseInt(args, 10);
 
                 // relative args shouldn't take us out of range
                 if (level < 1)
diff --git a/content/tabs.js b/content/tabs.js
index 220523d3..33e38fb4 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 336daade..ebe91ffb 100644
--- a/content/ui.js
+++ b/content/ui.js
@@ -699,7 +699,7 @@ 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 fc3c265d..59343aaa 100644
--- a/content/vimperator.js
+++ b/content/vimperator.js
@@ -195,7 +195,7 @@ const vimperator = (function() //{{{
             // Number
             else if (match = string.match(/^(\d+)$/))
             {
-                return parseInt(match[1]);
+                return parseInt(match[1], 10);
             }
 
             var reference = this.variableReference(string);