diff --git a/src/Language/Wasm/Binary.hs b/src/Language/Wasm/Binary.hs
index 64ccc62..9648269 100644
--- a/src/Language/Wasm/Binary.hs
+++ b/src/Language/Wasm/Binary.hs
@@ -877,10 +877,10 @@ instance Serialize ElemSegment where
         putVec $ map Expr elements
 
     get = do
-        op <- getWord8
         let funcIndexes = map ((:[]) . RefFunc . unIndex) <$> getVec
         let elemKind = byteGuard 0x00 >> return FuncRef
-        case op of
+        op <- getULEB128 32
+        case (op :: Word8) of
             0x00 -> do
                 offset <- getExpression
                 ElemSegment FuncRef (Active 0 offset) <$> funcIndexes
diff --git a/tests/Test.hs b/tests/Test.hs
index 45f8ec1..62d8482 100644
--- a/tests/Test.hs
+++ b/tests/Test.hs
@@ -19,7 +19,7 @@ main = do
   files <-
     filter (not . List.isPrefixOf "simd") . filter (List.isSuffixOf ".wast")
       <$> Directory.listDirectory "tests/spec"
-  -- let files = ["ref_func.wast"]
+  -- let files = ["binary-leb128.wast"]
   scriptTestCases <- (`mapM` files) $ \file -> do
     test <- LBS.readFile ("tests/spec/" ++ file)
     return $ testCase file $ do