diff --git a/eth/rlp.nim b/eth/rlp.nim
index 82107f7..eb86328 100644
--- a/eth/rlp.nim
+++ b/eth/rlp.nim
@@ -304,7 +304,11 @@ proc readImpl(rlp: var Rlp, T: type Integer): Integer =
   rlp.skipElem
 
 proc readImpl(rlp: var Rlp, T: type[enum]): T =
-  result = type(result)(rlp.toInt(int))
+  let value = rlp.toInt(int)
+  if value < ord(T.low) or value > ord(T.high):
+    raise newException(RlpTypeMismatch,
+                    "Enum expected, but the source RLP is not in valid range.")
+  result = type(result)(value)
   rlp.skipElem
 
 proc readImpl(rlp: var Rlp, T: type bool): T =
diff --git a/tests/rlp/test_api_usage.nim b/tests/rlp/test_api_usage.nim
index ef08dbc..acb7d18 100644
--- a/tests/rlp/test_api_usage.nim
+++ b/tests/rlp/test_api_usage.nim
@@ -194,3 +194,19 @@ test "encode/decode floats":
     chk  f
     chk -f
 
+test "invalid enum":
+  type
+    MyEnum = enum
+      foo,
+      bar
+
+  var writer = initRlpWriter()
+  writer.append(2)
+  writer.append(-1)
+  let bytes = writer.finish()
+  var rlp = rlpFromBytes(bytes.toRange)
+  expect RlpTypeMismatch:
+    discard rlp.read(MyEnum)
+  rlp.skipElem()
+  expect RlpTypeMismatch:
+    discard rlp.read(MyEnum)