diff --git a/packages/fork-choice/src/forkChoice/forkChoice.ts b/packages/fork-choice/src/forkChoice/forkChoice.ts
index 108bbead3da..773bd0a2b0f 100644
--- a/packages/fork-choice/src/forkChoice/forkChoice.ts
+++ b/packages/fork-choice/src/forkChoice/forkChoice.ts
@@ -621,7 +621,11 @@ export class ForkChoice implements IForkChoice {
   }
 
   getCanonicalBlockAtSlot(slot: Slot): IProtoBlock | null {
-    if (slot >= this.head.slot) {
+    if (slot > this.head.slot) {
+      return null;
+    }
+
+    if (slot === this.head.slot) {
       return this.head;
     }