diff --git a/src/data/system_log.ts b/src/data/system_log.ts
index 8f3e0854e4..9257c31080 100644
--- a/src/data/system_log.ts
+++ b/src/data/system_log.ts
@@ -10,7 +10,7 @@ export interface LoggedError {
   exception: string;
   count: number;
   // unix timestamp in seconds
-  first_occured: number;
+  first_occurred: number;
 }
 
 export const fetchSystemLog = (hass: HomeAssistant) =>
diff --git a/src/panels/developer-tools/logs/dialog-system-log-detail.ts b/src/panels/developer-tools/logs/dialog-system-log-detail.ts
index 74e2400430..b1e48d19a5 100644
--- a/src/panels/developer-tools/logs/dialog-system-log-detail.ts
+++ b/src/panels/developer-tools/logs/dialog-system-log-detail.ts
@@ -77,12 +77,12 @@ class DialogSystemLogDetail extends LitElement {
             <br />
             ${item.count > 0
               ? html`
-                  First occured:
+                  First occurred:
                   ${formatSystemLogTime(
-                    item.first_occured,
+                    item.first_occurred,
                     this.hass!.language
                   )}
-                  (${item.count} occurences) <br />
+                  (${item.count} occurrences) <br />
                 `
               : ""}
             Last logged:
diff --git a/src/panels/developer-tools/logs/system-log-card.ts b/src/panels/developer-tools/logs/system-log-card.ts
index ef88fcc2d2..72d59cdbd1 100644
--- a/src/panels/developer-tools/logs/system-log-card.ts
+++ b/src/panels/developer-tools/logs/system-log-card.ts
@@ -84,7 +84,7 @@ export class SystemLogCard extends LitElement {
                                       "ui.panel.developer-tools.tabs.logs.multiple_messages",
                                       "time",
                                       formatSystemLogTime(
-                                        item.first_occured,
+                                        item.first_occurred,
                                         this.hass!.language
                                       ),
                                       "counter",