diff --git a/libsolidity/inlineasm/AsmAnalysis.cpp b/libsolidity/inlineasm/AsmAnalysis.cpp
index 8fa72d7e3..3edc01ad8 100644
--- a/libsolidity/inlineasm/AsmAnalysis.cpp
+++ b/libsolidity/inlineasm/AsmAnalysis.cpp
@@ -345,7 +345,7 @@ bool AsmAnalyzer::expectExpression(Statement const& _statement)
 	{
 		m_errorReporter.typeError(
 			locationOf(_statement),
-			"Expected expression to return one item to the stack but did return " +
+			"Expected expression to return one item to the stack, but did return " +
 			boost::lexical_cast<string>(m_stackHeight - initialHeight) +
 			" items."
 		);