diff --git a/CHANGES.md b/CHANGES.md
index 1898b541..8b402d1f 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -3,10 +3,11 @@
 ## 0.21.8 (2024-mm-dd)
 - FIX: Fix stack save_as_int to use updated int values
 - ENH: Add a new type (`BandsType`) for list of BandType
-- FIX: Fixed PAZ Product Regex to properly indentify PAZ ST products as `PAZProduct` @guillemc23
+- FIX: Fixed PAZ Product Regex to properly indentify PAZ ST products as `PAZProduct` - by @guillemc23
+- FIX: Fixed preprocessing graph paths in order to support relative paths in more complex environments or contexts - by @guillemc23
 - FIX: Remove useless `_norm_diff` function `indices.py`
 - DOC: Update `conf.py` (remove useless hunks and set Sphinx 7 as base)
-- DOC: Added the [PAZ product guide](https://earth.esa.int/eogateway/documents/20142/37627/PAZ-Image-Products-Guide.pdf) to the PAZ Product documentation instead of the TerraSAR-X one @guillemc23
+- DOC: Added the [PAZ product guide](https://earth.esa.int/eogateway/documents/20142/37627/PAZ-Image-Products-Guide.pdf) to the PAZ Product documentation instead of the TerraSAR-X one - by @guillemc23
 
 ## 0.21.7 (2024-11-08)
 
diff --git a/eoreader/products/sar/sar_product.py b/eoreader/products/sar/sar_product.py
index 9d7d8094..48511994 100644
--- a/eoreader/products/sar/sar_product.py
+++ b/eoreader/products/sar/sar_product.py
@@ -746,7 +746,7 @@ def _pre_process_sar(self, band: sab, pixel_size: float = None, **kwargs) -> str
                         f"{spt}_{sat}_preprocess_default.xml"
                     )
                 else:
-                    pp_graph = AnyPath(os.environ[PP_GRAPH])
+                    pp_graph = AnyPath(os.environ[PP_GRAPH]).resolve()
                     if not pp_graph.is_file() or not pp_graph.suffix == ".xml":
                         FileNotFoundError(f"{pp_graph} cannot be found.")
 
@@ -847,7 +847,7 @@ def _despeckle_sar(self, band: sab, **kwargs) -> str:
             if DSPK_GRAPH not in os.environ:
                 dspk_graph = utils.get_data_dir().joinpath("sar_despeckle_default.xml")
             else:
-                dspk_graph = AnyPath(os.environ[DSPK_GRAPH])
+                dspk_graph = AnyPath(os.environ[DSPK_GRAPH]).resolve()
                 if not dspk_graph.is_file() or not dspk_graph.suffix == ".xml":
                     FileNotFoundError(f"{dspk_graph} cannot be found.")