diff --git a/config/src/main/java/org/hyperledger/besu/config/GenesisConfigFile.java b/config/src/main/java/org/hyperledger/besu/config/GenesisConfigFile.java
index 6b8b4e4fe5b..815e9e4ea0f 100644
--- a/config/src/main/java/org/hyperledger/besu/config/GenesisConfigFile.java
+++ b/config/src/main/java/org/hyperledger/besu/config/GenesisConfigFile.java
@@ -67,6 +67,15 @@ public static GenesisConfigFile development() {
     }
   }
 
+  public static GenesisConfigFile ecip1049dev() {
+    try {
+      return fromConfig(
+          Resources.toString(GenesisConfigFile.class.getResource("/ecip1049_dev.json"), UTF_8));
+    } catch (final IOException e) {
+      throw new IllegalStateException(e);
+    }
+  }
+
   public static GenesisConfigFile fromConfig(final String jsonString) {
     return fromConfig(JsonUtil.objectNodeFromString(jsonString, false));
   }
diff --git a/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/difficulty/fixed/FixedDifficultyCalculators.java b/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/difficulty/fixed/FixedDifficultyCalculators.java
index ceaf06e3530..7c64b570b0e 100644
--- a/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/difficulty/fixed/FixedDifficultyCalculators.java
+++ b/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/difficulty/fixed/FixedDifficultyCalculators.java
@@ -29,11 +29,16 @@ public class FixedDifficultyCalculators {
   public static final int DEFAULT_DIFFICULTY = 100;
 
   public static boolean isFixedDifficultyInConfig(final GenesisConfigOptions config) {
-    return config.getEthashConfigOptions().getFixedDifficulty().isPresent();
+    return config.getEthashConfigOptions().getFixedDifficulty().isPresent()
+        || config.getKeccak256ConfigOptions().getFixedDifficulty().isPresent();
   }
 
   public static DifficultyCalculator calculator(final GenesisConfigOptions config) {
-    long difficulty = config.getEthashConfigOptions().getFixedDifficulty().getAsLong();
+    long difficulty =
+        config
+            .getEthashConfigOptions()
+            .getFixedDifficulty()
+            .orElseGet(() -> config.getKeccak256ConfigOptions().getFixedDifficulty().getAsLong());
     return (time, parent, context) -> BigInteger.valueOf(difficulty);
   }
 }
diff --git a/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/difficulty/fixed/FixedProtocolScheduleTest.java b/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/difficulty/fixed/FixedProtocolScheduleTest.java
index 4204a5e4d76..c03286af04b 100644
--- a/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/difficulty/fixed/FixedProtocolScheduleTest.java
+++ b/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/difficulty/fixed/FixedProtocolScheduleTest.java
@@ -56,4 +56,36 @@ public void reportedDifficultyForAllBlocksIsAFixedValue() {
                 .nextDifficulty(1, parentHeader, null))
         .isEqualTo(FixedDifficultyCalculators.DEFAULT_DIFFICULTY);
   }
+
+  @Test
+  public void reportedDifficultyForAllBlocksIsAFixedValueKeccak() {
+
+    final ProtocolSchedule schedule =
+        FixedDifficultyProtocolSchedule.create(GenesisConfigFile.ecip1049dev().getConfigOptions());
+
+    final BlockHeaderTestFixture headerBuilder = new BlockHeaderTestFixture();
+
+    final BlockHeader parentHeader = headerBuilder.number(1).buildHeader();
+
+    assertThat(
+            schedule
+                .getByBlockNumber(0)
+                .getDifficultyCalculator()
+                .nextDifficulty(1, parentHeader, null))
+        .isEqualTo(FixedDifficultyCalculators.DEFAULT_DIFFICULTY);
+
+    assertThat(
+            schedule
+                .getByBlockNumber(500)
+                .getDifficultyCalculator()
+                .nextDifficulty(1, parentHeader, null))
+        .isEqualTo(FixedDifficultyCalculators.DEFAULT_DIFFICULTY);
+
+    assertThat(
+            schedule
+                .getByBlockNumber(500_000)
+                .getDifficultyCalculator()
+                .nextDifficulty(1, parentHeader, null))
+        .isEqualTo(FixedDifficultyCalculators.DEFAULT_DIFFICULTY);
+  }
 }