diff --git a/MsgPack/Decoder.swift b/MsgPack/Decoder.swift
index 48bb657..2dba09c 100644
--- a/MsgPack/Decoder.swift
+++ b/MsgPack/Decoder.swift
@@ -135,7 +135,8 @@ struct MsgPckSingleValueDecodingContainer: SingleValueDecodingContainer {
 		guard decoder.storage[base] == FormatID.float32.rawValue else {
 			throw Error.invalidFormat(decoder.storage[base])
 		}
-		return decoder.storage.read(at: base + 1)
+		let bitPattern: UInt32 = decoder.storage.bigEndianInteger(at: base + 1)
+		return .init(bitPattern: bitPattern)
 	}
 	
 	func decode(_ type: Double.Type) throws -> Double {
diff --git a/Playground.playground/Contents.swift b/Playground.playground/Contents.swift
index b0cae1d..bef399e 100644
--- a/Playground.playground/Contents.swift
+++ b/Playground.playground/Contents.swift
@@ -40,5 +40,9 @@ for byte in encodedGraph {
 
 let decoder = Decoder()
 
-let int8 = try encoder.encode(Double(-10))
-try decoder.decode(Double.self, from: int8)
+func roundtrip<T: Codable>(value: T) throws -> T {
+	return try decoder.decode(T.self, from: encoder.encode(value))
+}
+
+var x: UInt64? = nil
+try roundtrip(value: false)