diff --git a/CHANGES.md b/CHANGES.md
index 0e619459be0..524b981845b 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -11,6 +11,7 @@ Fixed Issues:
 * [#12113](http://dev.ckeditor.com/ticket/12113): Fixed: Code snippet should be presented in elements path as "codesnippet".
 * [#12311](http://dev.ckeditor.com/ticket/12311): Fixed: Remove format should also remove `<cite>` elements.
 * [#12261](http://dev.ckeditor.com/ticket/12261): Fixed: Filter has to be destroyed and removed from [`CKEDITOR.filter.instances`](http://docs.ckeditor.com/#!/api/CKEDITOR.filter-static-property-instances) on editor destroy.
+* [#12163](http://dev.ckeditor.com/ticket/12163): Fixed: Maximize plugin should abort its initialization if the [Shared Spaces plugin](http://ckeditor.com/addon/sharedspace) is initialized.
 
 ## CKEditor 4.4.4
 
diff --git a/plugins/maximize/plugin.js b/plugins/maximize/plugin.js
index 4441391dbeb..617c4355d95 100644
--- a/plugins/maximize/plugin.js
+++ b/plugins/maximize/plugin.js
@@ -96,10 +96,14 @@
 		icons: 'maximize', // %REMOVE_LINE_CORE%
 		hidpi: true, // %REMOVE_LINE_CORE%
 		init: function( editor ) {
-			// Maximize plugin isn't available in inline mode yet.
+			// Maximize plugin isn't available in inline mode yet...
 			if ( editor.elementMode == CKEDITOR.ELEMENT_MODE_INLINE )
 				return;
 
+			// ...and when sharedspace plugin is present.
+			if ( editor.plugins.sharedspace )
+				return;
+
 			var lang = editor.lang;
 			var mainDocument = CKEDITOR.document,
 				mainWindow = mainDocument.getWindow();
diff --git a/plugins/sharedspace/samples/sharedspace.html b/plugins/sharedspace/samples/sharedspace.html
index df7ff4d1dd6..0c2d89600e9 100644
--- a/plugins/sharedspace/samples/sharedspace.html
+++ b/plugins/sharedspace/samples/sharedspace.html
@@ -83,7 +83,7 @@ <h3>
 
 		CKEDITOR.appendTo( 'framed1', {
 				extraPlugins: 'sharedspace',
-				removePlugins: 'maximize,resize',
+				removePlugins: 'resize',
 				sharedSpaces: {
 					top: 'top',
 					bottom: 'bottom'
@@ -94,7 +94,7 @@ <h3>
 
 		CKEDITOR.appendTo( 'framed2', {
 				extraPlugins: 'sharedspace',
-				removePlugins: 'maximize,resize',
+				removePlugins: 'resize',
 				sharedSpaces: {
 					top: 'top',
 					bottom: 'bottom'