diff --git a/libsolidity/analysis/TypeChecker.cpp b/libsolidity/analysis/TypeChecker.cpp
index 889b72b95..f6e4d6c8c 100644
--- a/libsolidity/analysis/TypeChecker.cpp
+++ b/libsolidity/analysis/TypeChecker.cpp
@@ -469,7 +469,7 @@ bool TypeChecker::visit(FunctionDefinition const& _function)
 bool TypeChecker::visit(VariableDeclaration const& _variable)
 {
 	if (m_scope->contractKind() == ContractDefinition::ContractKind::Interface)
-		typeError(_variable.location(), "Variables cannot be defined in interfaces.");
+		typeError(_variable.location(), "Variables cannot be declared in interfaces.");
 
 	// Variables can be declared without type (with "var"), in which case the first assignment
 	// sets the type.
diff --git a/test/libsolidity/SolidityNameAndTypeResolution.cpp b/test/libsolidity/SolidityNameAndTypeResolution.cpp
index 0861dded8..c30bb0117 100644
--- a/test/libsolidity/SolidityNameAndTypeResolution.cpp
+++ b/test/libsolidity/SolidityNameAndTypeResolution.cpp
@@ -5408,7 +5408,7 @@ BOOST_AUTO_TEST_CASE(interface_variables)
 			uint a;
 		}
 	)";
-	CHECK_ERROR(text, TypeError, "Variables cannot be defined in interfaces");
+	CHECK_ERROR(text, TypeError, "Variables cannot be declared in interfaces");
 }
 
 BOOST_AUTO_TEST_CASE(using_interface)