diff --git a/src/main/java/io/optimism/config/Config.java b/src/main/java/io/optimism/config/Config.java
index c7add94..ddbf0cc 100644
--- a/src/main/java/io/optimism/config/Config.java
+++ b/src/main/java/io/optimism/config/Config.java
@@ -370,9 +370,9 @@ public boolean isGranite(BigInteger time) {
          * @return true if the time is the granite activation block, otherwise false.
          */
         public boolean isGraniteActivationBlock(BigInteger time) {
-            return isFjord(time)
+            return isGranite(time)
                     && time.compareTo(blockTime) >= 0
-                    && time.subtract(blockTime).compareTo(fjordTime) < 0;
+                    && time.subtract(blockTime).compareTo(graniteTime) < 0;
         }
 
         /**