diff --git a/src/exception.cpp b/src/exception.cpp
index cd79ebc..3fe7a99 100644
--- a/src/exception.cpp
+++ b/src/exception.cpp
@@ -21,6 +21,16 @@
 namespace exception
 {
 
+Incomplete::Incomplete(const char* what) :
+    std::system_error(std::make_error_code(std::errc::illegal_byte_sequence),
+                      what)
+{}
+
+Incomplete::Incomplete(const std::string& what) :
+    std::system_error(std::make_error_code(std::errc::illegal_byte_sequence),
+                      what)
+{}
+
 WouldBlock::WouldBlock(const char* what) :
     std::system_error(std::make_error_code(std::errc::operation_would_block),
                       what)