diff --git a/libsolidity/parsing/DocStringParser.cpp b/libsolidity/parsing/DocStringParser.cpp
index d058d5569..d9588e5ca 100644
--- a/libsolidity/parsing/DocStringParser.cpp
+++ b/libsolidity/parsing/DocStringParser.cpp
@@ -72,7 +72,7 @@ bool DocStringParser::parse(string const& _docString, ErrorReporter& _errorRepor
 			auto tagNameEndPos = firstWhitespaceOrNewline(tagPos, end);
 			if (tagNameEndPos == end)
 			{
-				appendError("End of tag " + string(tagPos, tagNameEndPos) + "not found");
+				appendError("End of tag " + string(tagPos, tagNameEndPos) + " not found");
 				break;
 			}
 
diff --git a/test/libsolidity/syntaxTests/docstring_empty_description.sol b/test/libsolidity/syntaxTests/natspec/docstring_empty_description.sol
similarity index 100%
rename from test/libsolidity/syntaxTests/docstring_empty_description.sol
rename to test/libsolidity/syntaxTests/natspec/docstring_empty_description.sol
diff --git a/test/libsolidity/syntaxTests/natspec/docstring_empty_tag.sol b/test/libsolidity/syntaxTests/natspec/docstring_empty_tag.sol
new file mode 100644
index 000000000..9a28143a1
--- /dev/null
+++ b/test/libsolidity/syntaxTests/natspec/docstring_empty_tag.sol
@@ -0,0 +1,6 @@
+contract C {
+    /// @param
+    function vote(uint id) public;
+}
+// ----
+// DocstringParsingError: End of tag @param not found