diff --git a/src/components/definitionList/sp-definition-list-dd.ts b/src/components/definitionList/sp-definition-list-dd.ts
index 8afc83d..a472c42 100644
--- a/src/components/definitionList/sp-definition-list-dd.ts
+++ b/src/components/definitionList/sp-definition-list-dd.ts
@@ -19,13 +19,15 @@ export class SpDefinitionListDd extends HTMLElement {
   }
 
   connectedCallback() {
-    this.shadowRoot.adoptedStyleSheets = [
-      ...this.shadowRoot.adoptedStyleSheets,
-      styles,
-    ];
-    this.#ddElement.classList.add("base");
-    this.#ddElement.innerHTML = this.innerHTML;
-    this.shadowRoot.appendChild(this.#ddElement);
+    if (this.shadowRoot) {
+      this.shadowRoot.adoptedStyleSheets = [
+        ...this.shadowRoot.adoptedStyleSheets,
+        styles,
+      ];
+      this.#ddElement.classList.add("base");
+      this.#ddElement.innerHTML = this.innerHTML;
+      this.shadowRoot.appendChild(this.#ddElement);
+    }
   }
 }
 
diff --git a/src/components/definitionList/sp-definition-list-dt.ts b/src/components/definitionList/sp-definition-list-dt.ts
index 7c0a005..c7aa400 100644
--- a/src/components/definitionList/sp-definition-list-dt.ts
+++ b/src/components/definitionList/sp-definition-list-dt.ts
@@ -19,13 +19,15 @@ export class SpDefinitionListDt extends HTMLElement {
   }
 
   connectedCallback() {
-    this.shadowRoot.adoptedStyleSheets = [
-      ...this.shadowRoot.adoptedStyleSheets,
-      styles,
-    ];
-    this.#dtElement.classList.add("base");
-    this.#dtElement.innerHTML = this.innerHTML;
-    this.shadowRoot.appendChild(this.#dtElement);
+    if (this.shadowRoot) {
+      this.shadowRoot.adoptedStyleSheets = [
+        ...this.shadowRoot.adoptedStyleSheets,
+        styles,
+      ];
+      this.#dtElement.classList.add("base");
+      this.#dtElement.innerHTML = this.innerHTML;
+      this.shadowRoot.appendChild(this.#dtElement);
+    }
   }
 }
 
diff --git a/src/components/definitionList/sp-definition-list.ts b/src/components/definitionList/sp-definition-list.ts
index 93f5d96..47af04b 100644
--- a/src/components/definitionList/sp-definition-list.ts
+++ b/src/components/definitionList/sp-definition-list.ts
@@ -18,13 +18,15 @@ export class SpDefinitionList extends HTMLElement {
   }
 
   connectedCallback() {
-    this.shadowRoot.adoptedStyleSheets = [
-      ...this.shadowRoot.adoptedStyleSheets,
-      styles,
-    ];
-    this.#dlElement.classList.add("base");
-    this.#dlElement.appendChild(this.#slotElement);
-    this.shadowRoot.appendChild(this.#dlElement);
+    if (this.shadowRoot) {
+      this.shadowRoot.adoptedStyleSheets = [
+        ...this.shadowRoot.adoptedStyleSheets,
+        styles,
+      ];
+      this.#dlElement.classList.add("base");
+      this.#dlElement.appendChild(this.#slotElement);
+      this.shadowRoot.appendChild(this.#dlElement);
+    }
   }
 }