diff --git a/bauh/commons/util.py b/bauh/commons/util.py
index 750895c8..f2d04f95 100644
--- a/bauh/commons/util.py
+++ b/bauh/commons/util.py
@@ -29,7 +29,7 @@ def deep_update(source: dict, overrides: dict):
 
 
 def size_to_byte(size: Union[float, int, str], unit: str, logger: Optional[Logger] = None) -> Optional[float]:
-    lower_unit = unit.lower()
+    lower_unit = unit.strip().lower()
 
     if isinstance(size, str):
         try:
diff --git a/tests/common/test_util.py b/tests/common/test_util.py
index b91a39e9..ea9c8267 100644
--- a/tests/common/test_util.py
+++ b/tests/common/test_util.py
@@ -41,4 +41,4 @@ class SizeToByteTest(TestCase):
         self.assertEqual(6383852471797678, size_to_byte('5.67', 'P'))
 
     def test_must_treat_string_sizes_before_converting(self):
-        self.assertEqual(58675.2, size_to_byte(' 57 , 3  ', 'K'))
+        self.assertEqual(58675.2, size_to_byte(' 57 , 3  ', ' K '))