diff --git a/packages/ckeditor5-math/tests/automath.ts b/packages/ckeditor5-math/tests/automath.ts
index a45e9fc18..c2c92a089 100644
--- a/packages/ckeditor5-math/tests/automath.ts
+++ b/packages/ckeditor5-math/tests/automath.ts
@@ -15,6 +15,7 @@ describe( 'AutoMath - integration', () => {
 		return ClassicEditor
 			.create( editorElement, {
 				plugins: [ Mathematics, AutoMath, Typing, Paragraph ],
+				licenseKey: "GPL",
 				math: {
 					engine: ( equation, element, display ) => {
 						if ( display ) {
diff --git a/packages/ckeditor5-math/tests/lazyload.ts b/packages/ckeditor5-math/tests/lazyload.ts
index 5c0f6c50c..35ab1f3e8 100644
--- a/packages/ckeditor5-math/tests/lazyload.ts
+++ b/packages/ckeditor5-math/tests/lazyload.ts
@@ -13,6 +13,7 @@ describe( 'Lazy load', () => {
 		return ClassicEditor
 			.create( editorElement, {
 				...config,
+				licenseKey: "GPL",
 				plugins: [ MathUI ]
 			} )
 			.then( newEditor => {
diff --git a/packages/ckeditor5-math/tests/math.ts b/packages/ckeditor5-math/tests/math.ts
index da45a0617..ecdc85b20 100644
--- a/packages/ckeditor5-math/tests/math.ts
+++ b/packages/ckeditor5-math/tests/math.ts
@@ -15,7 +15,8 @@ describe( 'Math', () => {
 
 		return ClassicEditor
 			.create( editorElement, {
-				plugins: [ Mathematics ]
+				plugins: [ Mathematics ],
+				licenseKey: "GPL"
 			} )
 			.then( newEditor => {
 				editor = newEditor;
diff --git a/packages/ckeditor5-math/tests/mathui.ts b/packages/ckeditor5-math/tests/mathui.ts
index 7b5d65f7b..d3daf1b19 100644
--- a/packages/ckeditor5-math/tests/mathui.ts
+++ b/packages/ckeditor5-math/tests/mathui.ts
@@ -33,8 +33,9 @@ describe( 'MathUI', () => {
 						} else {
 							element.innerHTML = '\\(' + equation + '\\)';
 						}
-					}
-				}
+					},
+				},
+				licenseKey: "GPL"
 			} )
 			.then( newEditor => {
 				editor = newEditor;