diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index abfc83ece..b0d5df57b 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -23,6 +23,10 @@ Internal changes
 * Adjusted the ``TestOfficialYaml`` test to use a dynamic method for finding the installed location of `xclim`. (:pull:`2028`).
 * Adjusted two tests for better handling when running in Windows environments. (:pull:`2057`).
 
+Bug fixes
+^^^^^^^^^
+* Fixed an issue in ``xclim.core.units.to_agg_units`` that broke the resampling when computing on unitless data (:pull:`2060`).
+
 v0.54.0 (2024-12-16)
 --------------------
 Contributors to this version: Trevor James Smith (:user:`Zeitsperre`), Pascal Bourgault (:user:`aulemahal`), Éric Dupuis (:user:`coxipi`), Sascha Hofmann (:user:`saschahofmann`).
diff --git a/src/xclim/core/units.py b/src/xclim/core/units.py
index 036835d3e..c4613cca9 100644
--- a/src/xclim/core/units.py
+++ b/src/xclim/core/units.py
@@ -666,6 +666,9 @@ def to_agg_units(
     >>> degdays.units
     'd K'
     """
+    if "units" not in orig.attrs:
+        return out
+
     is_difference = True if op in ["std", "var"] else None
 
     if op in ["amin", "min", "amax", "max", "mean", "sum", "std"]: