diff --git a/src/validation.cpp b/src/validation.cpp
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1637,7 +1637,8 @@
         }
     }
 
-    return nVersion;
+    // Clear the last 4 bits (miner fund activation).
+    return nVersion & ~uint32_t(0x0f);
 }
 
 // Returns the script flags which should be checked for the block after
diff --git a/test/functional/abc-block-sigchecks-activation.py b/test/functional/abc-block-sigchecks-activation.py
--- a/test/functional/abc-block-sigchecks-activation.py
+++ b/test/functional/abc-block-sigchecks-activation.py
@@ -70,8 +70,7 @@
 
     ctx = CTransaction()
     ctx.vin.append(CTxIn(COutPoint(spendfrom.sha256, 0), b''))
-    ctx.vout.append(
-        CTxOut(0, bytes([OP_TRUE])))
+    ctx.vout.append(CTxOut(0, bytes([OP_TRUE])))
     ctx.vout.append(customout)
     pad_tx(ctx)