diff --git a/packages/core-data/src/selectors.ts b/packages/core-data/src/selectors.ts
index a62e1e54aabf87..fb1c8bd0d59abc 100644
--- a/packages/core-data/src/selectors.ts
+++ b/packages/core-data/src/selectors.ts
@@ -843,7 +843,7 @@ export function hasRedo( state: State ): boolean {
  *
  * @return The current theme.
  */
-export function getCurrentTheme( state ): any {
+export function getCurrentTheme( state: State ): any {
 	return getEntityRecord( state, 'root', 'theme', state.currentTheme );
 }