diff --git a/libsolidity/ast/AST.cpp b/libsolidity/ast/AST.cpp
index 45ff69c58..dd582e544 100644
--- a/libsolidity/ast/AST.cpp
+++ b/libsolidity/ast/AST.cpp
@@ -189,14 +189,6 @@ void ContractDefinition::setUserDocumentation(Json::Value const& _userDocumentat
 	m_userDocumentation = _userDocumentation;
 }
 
-
-string ContractDefinition::fullyQualifiedName() const
-{
-	std::string sourceString = *(location().sourceName);
-	std::string qualifiedName = (sourceString.empty() ? ("") : (sourceString + ":")) + name();
-	return qualifiedName;
-}
-
 vector<Declaration const*> const& ContractDefinition::inheritableMembers() const
 {
 	if (!m_inheritableMembers)
diff --git a/libsolidity/ast/AST.h b/libsolidity/ast/AST.h
index 060cf9737..f72b272c2 100644
--- a/libsolidity/ast/AST.h
+++ b/libsolidity/ast/AST.h
@@ -161,6 +161,7 @@ public:
 	/// @returns the source name this declaration is present in.
 	/// Can be combined with annotation().canonicalName to form a globally unique name.
 	std::string sourceUnitName() const;
+	std::string fullyQualifiedName() const { return sourceUnitName() + ":" + name(); }
 
 	virtual bool isLValue() const { return false; }
 	virtual bool isPartOfExternalInterface() const { return false; }
@@ -358,8 +359,6 @@ public:
 	Json::Value const& devDocumentation() const;
 	void setDevDocumentation(Json::Value const& _devDocumentation);
 
-	std::string fullyQualifiedName() const;
-
 	virtual TypePointer type() const override;
 
 	virtual ContractDefinitionAnnotation& annotation() const override;