diff --git a/xs/src/libslic3r/PrintGCode.cpp b/xs/src/libslic3r/PrintGCode.cpp
index 40d118953..44e3289e7 100644
--- a/xs/src/libslic3r/PrintGCode.cpp
+++ b/xs/src/libslic3r/PrintGCode.cpp
@@ -383,10 +383,10 @@ PrintGCode::process_layer(size_t idx, const Layer* layer, const Points& copies)
     
     // extrude skirt along raft layers and normal obj layers
     // (not along interlaced support material layers)
-    if (!_skirt_done.size() == 0 && (print.has_infinite_skirt() || (_skirt_done.rbegin())->first < print.config.skirt_height)
-        && typeid(layer) != typeid(SupportLayer*)
-        && _skirt_done.count(scale_(layer->print_z)) > 0
-        && layer->id() < static_cast<size_t>(obj.config.raft_layers)) {
+    if ((print.has_infinite_skirt() || _skirt_done.size() == 0 || (_skirt_done.rbegin())->first < print.config.skirt_height)
+        && _skirt_done.count(scale_(layer->print_z)) == 0
+        && typeid(layer) != typeid(SupportLayer*) || layer->id() < static_cast<size_t>(obj.config.raft_layers)) {
+
 
         gcodegen.set_origin(Pointf(0,0));
         gcodegen.avoid_crossing_perimeters.use_external_mp = true;