diff --git a/pcbnew/legacy_plugin.h b/pcbnew/legacy_plugin.h
index 4aea066d6c..d99935daec 100644
--- a/pcbnew/legacy_plugin.h
+++ b/pcbnew/legacy_plugin.h
@@ -151,7 +151,7 @@ protected:
     ///> otherwise returns unchanged net code
     inline int getNetCode( int aNetCode )
     {
-        if( aNetCode < (int) m_netCodes.size() )
+        if( (unsigned int) aNetCode < m_netCodes.size() )
             return m_netCodes[aNetCode];
 
         return aNetCode;