diff --git a/Code/FeatureExtraction/otbImageToPathListAlignFilter.txx b/Code/FeatureExtraction/otbImageToPathListAlignFilter.txx
index d2bc3ead0b89dc38f4d057ac08bdd7caf2d4da0d..69decb3d65ac0a52c59fb041caf785fc3e439502 100644
--- a/Code/FeatureExtraction/otbImageToPathListAlignFilter.txx
+++ b/Code/FeatureExtraction/otbImageToPathListAlignFilter.txx
@@ -392,7 +392,7 @@ ImageToPathListAlignFilter<TInputImage,TOutputPath>
   {
     printf("side %d/4 ",side+1);
 
-    theta0 = 0.5*CONST_PI*(double)side;
+    theta0 = CONST_PI_2*(double)side;
     mx = ((side==0 || side==2)?1:0);
     my = ((side==1 || side==3)?1:0);
     ox = ((side==1)?nx-1:0);