diff --git a/docs/changes/newsfragments/454.bugfix b/docs/changes/newsfragments/454.bugfix
new file mode 100644
index 000000000..7774f9a89
--- /dev/null
+++ b/docs/changes/newsfragments/454.bugfix
@@ -0,0 +1 @@
+Fix FSL presence checking status code by `Fede Raimondo`_
diff --git a/junifer/pipeline/utils.py b/junifer/pipeline/utils.py
index f8d66f90a..66dd433d7 100644
--- a/junifer/pipeline/utils.py
+++ b/junifer/pipeline/utils.py
@@ -155,7 +155,9 @@ def _check_fsl(commands: Optional[list[str]] = None) -> bool:
         shell=True,  # is unsafe but kept for resolution via PATH
         check=False,
     )
-    fsl_found = completed_process.returncode == 1
+    fsl_found = (
+        completed_process.returncode == 1 or completed_process.returncode == 0
+    )
 
     # Check for specific commands
     if fsl_found and commands is not None: