diff --git a/reactos/lib/glu32/libnurbs/nurbtess/sampleComp.cc b/reactos/lib/glu32/libnurbs/nurbtess/sampleComp.cc
index a06c7046ec2..ec91eccb023 100644
--- a/reactos/lib/glu32/libnurbs/nurbtess/sampleComp.cc
+++ b/reactos/lib/glu32/libnurbs/nurbtess/sampleComp.cc
@@ -157,9 +157,9 @@ void sampleCompLeft(Real* topVertex, Real* botVertex,
   /*find out whether there is a trim vertex which is
    *inbetween the top and bot grid lines or not.
    */
-  Int midIndex1;
-  Int midIndex2;
-  Int gridMidIndex1, gridMidIndex2;
+  Int midIndex1 = 0;
+  Int midIndex2 = 0;
+  Int gridMidIndex1 = 0, gridMidIndex2 = 0;
   //midIndex1: array[i] <= v, array[i-1] > v
   //midIndex2: array[i] >= v, array[i+1] < v
   // v(gridMidIndex1) >= v(midindex1) > v(gridMidIndex1+1)
diff --git a/reactos/lib/glu32/libnurbs/nurbtess/sampleCompRight.cc b/reactos/lib/glu32/libnurbs/nurbtess/sampleCompRight.cc
index 93474c38d28..baba014c0d2 100644
--- a/reactos/lib/glu32/libnurbs/nurbtess/sampleCompRight.cc
+++ b/reactos/lib/glu32/libnurbs/nurbtess/sampleCompRight.cc
@@ -72,7 +72,7 @@ void sampleCompRight(Real* topVertex, Real* botVertex,
    */
   Int midIndex1;
   Int midIndex2;
-  Int gridMidIndex1, gridMidIndex2;
+  Int gridMidIndex1 =0, gridMidIndex2 =0;
   //midIndex1: array[i] <= v, array[i+1] > v
   //midIndex2: array[i] >= v,  array[i+1] < v
   midIndex1 = rightChain->findIndexBelowGen(rightGridChain->get_v_value(gridIndex1),