diff --git a/libs/io/include/psemek/io/error.hpp b/libs/io/include/psemek/io/error.hpp
index 926e6c0d..b531b75f 100644
--- a/libs/io/include/psemek/io/error.hpp
+++ b/libs/io/include/psemek/io/error.hpp
@@ -21,4 +21,16 @@ namespace psemek::io
 		char const * what() const noexcept override;
 	};
 
+	struct istream_end
+		: std::exception
+	{
+		char const * what() const noexcept override;
+	};
+
+	struct ostream_end
+		: std::exception
+	{
+		char const * what() const noexcept override;
+	};
+
 }
diff --git a/libs/io/source/error.cpp b/libs/io/source/error.cpp
index d48a167d..2690fb13 100644
--- a/libs/io/source/error.cpp
+++ b/libs/io/source/error.cpp
@@ -13,4 +13,14 @@ namespace psemek::io
 		return "Attempt to write to null output stream";
 	}
 
+	char const * istream_end::what() const noexcept
+	{
+		return "Unexpected input stream end";
+	}
+
+	char const * ostream_end::what() const noexcept
+	{
+		return "Unexpected output stream end";
+	}
+
 }