diff --git a/xs/src/libslic3r/PrintRegion.cpp b/xs/src/libslic3r/PrintRegion.cpp
index e5b9092e4c..1807f84bc6 100644
--- a/xs/src/libslic3r/PrintRegion.cpp
+++ b/xs/src/libslic3r/PrintRegion.cpp
@@ -50,7 +50,7 @@ PrintRegion::flow(FlowRole role, double layer_height, bool bridge, bool first_la
     
     // get the configured nozzle_diameter for the extruder associated
     // to the flow role requested
-    size_t extruder;  // 1-based
+    size_t extruder = 0;    // 1-based
     if (role == frPerimeter || role == frExternalPerimeter) {
         extruder = this->config.perimeter_extruder;
     } else if (role == frInfill) {
diff --git a/xs/src/polypartition.cpp b/xs/src/polypartition.cpp
index b1e965cfeb..bdd23f6f3f 100644
--- a/xs/src/polypartition.cpp
+++ b/xs/src/polypartition.cpp
@@ -170,7 +170,7 @@ int TPPLPartition::Intersects(TPPLPoint &p11, TPPLPoint &p12, TPPLPoint &p21, TP
 int TPPLPartition::RemoveHoles(list<TPPLPoly> *inpolys, list<TPPLPoly> *outpolys) {
 	list<TPPLPoly> polys;
 	list<TPPLPoly>::iterator holeiter,polyiter,iter,iter2;
-	long i,i2,holepointindex,polypointindex;
+	long i,i2,holepointindex,polypointindex = 0;
 	TPPLPoint holepoint,polypoint,bestpolypoint;
 	TPPLPoint linep1,linep2;
 	TPPLPoint v1,v2;