diff --git a/src/libslic3r/Format/SL1.cpp b/src/libslic3r/Format/SL1.cpp
index 554e49b5a..4038cb046 100644
--- a/src/libslic3r/Format/SL1.cpp
+++ b/src/libslic3r/Format/SL1.cpp
@@ -248,7 +248,7 @@ std::vector<ExPolygons> extract_slices_from_sla_archive(
     {
         double          incr, val, prev;
         bool            stop = false;
-        tbb::spin_mutex mutex;
+        tbb::spin_mutex mutex = {};
     } st {100. / slices.size(), 0., 0.};
 
     tbb::parallel_for(size_t(0), arch.images.size(),
@@ -375,7 +375,7 @@ void fill_iniconf(ConfMap &m, const SLAPrint &print)
     bool hollow_en = false;
     auto it = print.objects().begin();
     while (!hollow_en && it != print.objects().end())
-        hollow_en = hollow_en || (*it++)->config().hollowing_enable.getBool();
+        hollow_en = (*it++)->config().hollowing_enable;
 
     m["hollow"] = hollow_en ? "1" : "0";