diff --git a/eeschema/sim/ngspice.cpp b/eeschema/sim/ngspice.cpp
index 9fcbee6d80..fb8d032064 100644
--- a/eeschema/sim/ngspice.cpp
+++ b/eeschema/sim/ngspice.cpp
@@ -206,7 +206,7 @@ bool NGSPICE::LoadNetlist( const string& aNetlist )
     ngSpice_Circ( lines.data() );
 
     for( auto line : lines )
-        delete line;
+        free( line );
 
     return true;
 }