diff --git a/Utilities/otbossim/src/ossim/base/ossimGpt.cpp b/Utilities/otbossim/src/ossim/base/ossimGpt.cpp
index 1c58e5743f589ce790c0d0a6e4d8f13d111054c4..c52d4babca12a5232782136d5c7b6c72fe609b5c 100644
--- a/Utilities/otbossim/src/ossim/base/ossimGpt.cpp
+++ b/Utilities/otbossim/src/ossim/base/ossimGpt.cpp
@@ -457,9 +457,9 @@ double ossimGpt::azimuthTo(const ossimGpt& gpt) const
 
    // Use alternate local method (not great circle):
    double mean_lat = 0.5*(lat + gpt.lat);
-   double dlon = cosd(mean_lat)*(gpt.lon - lon);
+   double dlon = ossim::cosd(mean_lat)*(gpt.lon - lon);
    double dlat = gpt.lat - lat;
-   double theta = atan2d(dlon,dlat);
+   double theta = ossim::atan2d(dlon,dlat);
    if (theta < 0)
       theta += 360.0;
    return theta;
diff --git a/Utilities/otbossim/src/ossim/parallel/ossimOrthoIgen.cpp b/Utilities/otbossim/src/ossim/parallel/ossimOrthoIgen.cpp
index 1cfb7eb3e9012030e152404f2ac0d35eba256bef..cb61cf2fc0a0ea4f78f2380cfe7a8d30cda36fee 100644
--- a/Utilities/otbossim/src/ossim/parallel/ossimOrthoIgen.cpp
+++ b/Utilities/otbossim/src/ossim/parallel/ossimOrthoIgen.cpp
@@ -2902,7 +2902,7 @@ void ossimOrthoIgen::setProductGsd()
    {
       // Need to adjust the resolution in the longitude direction if the user requested geo-scaling:
       if (!ossim::isnan(theGeoScalingLatitude))
-         resolution.lon = resolution.lat/cosd(theGeoScalingLatitude);
+         resolution.lon = resolution.lat/ossim::cosd(theGeoScalingLatitude);
       theProductProjection->setDecimalDegreesPerPixel(resolution);
    }
    else 
diff --git a/Utilities/otbossim/src/ossim/projection/ossimRS1SarModel.cpp b/Utilities/otbossim/src/ossim/projection/ossimRS1SarModel.cpp
index 01858649ec4e30974b2fff1104e911255de68659..d78fed2ffd0457e5d6f3f2fbd7554fea7d541a12 100644
--- a/Utilities/otbossim/src/ossim/projection/ossimRS1SarModel.cpp
+++ b/Utilities/otbossim/src/ossim/projection/ossimRS1SarModel.cpp
@@ -686,7 +686,7 @@ void ossimRS1SarModel::eciToEcfXform(const double& acq_time, NEWMAT::Matrix& xfo
    
    // Establish rotation:
    double cos_gha = ossim::cosd(gha);
-   double sin_gha = sind(gha);
+   double sin_gha = ossim::sind(gha);
 
    // Establish rotation matrix:
    xform = ossimMatrix3x3::create(cos_gha,  sin_gha,  0.0,