diff --git a/src/libs/ifc/xml/vabstractconverter.cpp b/src/libs/ifc/xml/vabstractconverter.cpp
index 5524015b5..2ff316e70 100644
--- a/src/libs/ifc/xml/vabstractconverter.cpp
+++ b/src/libs/ifc/xml/vabstractconverter.cpp
@@ -147,7 +147,7 @@ QString VAbstractConverter::Convert()
 }
 
 //---------------------------------------------------------------------------------------------------------------------
-int VAbstractConverter::GetCurrentFormatVersion() const
+auto VAbstractConverter::GetCurrentFormatVersion() const -> unsigned
 {
     return m_ver;
 }
diff --git a/src/libs/ifc/xml/vabstractconverter.h b/src/libs/ifc/xml/vabstractconverter.h
index bd6e25591..804b9ec2f 100644
--- a/src/libs/ifc/xml/vabstractconverter.h
+++ b/src/libs/ifc/xml/vabstractconverter.h
@@ -51,7 +51,7 @@ public:
 
     QString Convert();
 
-    int GetCurrentFormatVersion() const;
+    unsigned GetCurrentFormatVersion() const;
 
 protected:
     unsigned m_ver;