diff --git a/src/transformations/gridshift.cpp b/src/transformations/gridshift.cpp
index 7e9e7f92e0..fcf2985a8f 100644
--- a/src/transformations/gridshift.cpp
+++ b/src/transformations/gridshift.cpp
@@ -168,13 +168,13 @@ bool gridshiftData::checkGridTypes(PJ *P, bool &isProjectedCoord) {
             return false;
         }
         try {
-            m_offsetX = osgeo::proj::internal::c_locale_stod(offsetX);
+            m_offsetX = NS_PROJ::internal::c_locale_stod(offsetX);
         } catch (const std::exception &) {
             proj_log_error(P, _("Invalid offset value"));
             return false;
         }
         try {
-            m_offsetY = osgeo::proj::internal::c_locale_stod(offsetY);
+            m_offsetY = NS_PROJ::internal::c_locale_stod(offsetY);
         } catch (const std::exception &) {
             proj_log_error(P, _("Invalid offset value"));
             return false;