diff --git a/src/libslic3r/ExtrusionEntityCollection.cpp b/src/libslic3r/ExtrusionEntityCollection.cpp
index 48c538c49..e2da7c57d 100644
--- a/src/libslic3r/ExtrusionEntityCollection.cpp
+++ b/src/libslic3r/ExtrusionEntityCollection.cpp
@@ -186,7 +186,8 @@ ExtrusionEntityCollection::min_mm3_per_mm() const
 {
     double min_mm3_per_mm = std::numeric_limits<double>::max();
     for (const ExtrusionEntity *entity : this->entities)
-        min_mm3_per_mm = std::min(min_mm3_per_mm, entity->min_mm3_per_mm());
+        if(entity->role() != erGapFill && entity->role() != erThinWall && entity->role() != erMilling)
+            min_mm3_per_mm = std::min(min_mm3_per_mm, entity->min_mm3_per_mm());
     return min_mm3_per_mm;
 }