diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2668bbc2..3af63aba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -29,6 +29,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Renamed `text_merge` to `text_concat` for better alignment with `array_concat` and existing implementations.
 - `apply_neighborhood`: Allow `null` as default value for units.
 - `run_udf`: Allow all data types instead of just objects in the `context` parameter. [#376](https://github.com/Open-EO/openeo-processes/issues/376)
+- `load_collection` and `load_result`: Require at least one band if not set to `null`. [#372](https://github.com/Open-EO/openeo-processes/issues/372)
 
 ### Removed
 
diff --git a/load_collection.json b/load_collection.json
index dfdb72ca..d6615f21 100644
--- a/load_collection.json
+++ b/load_collection.json
@@ -161,6 +161,7 @@
             "schema": [
                 {
                     "type": "array",
+                    "minItems": 1,
                     "items": {
                         "type": "string",
                         "subtype": "band-name"
@@ -303,4 +304,4 @@
             "title": "List of common band names as specified by the STAC specification"
         }
     ]
-}
\ No newline at end of file
+}
diff --git a/proposals/load_result.json b/proposals/load_result.json
index d8b70c6a..fa056b48 100644
--- a/proposals/load_result.json
+++ b/proposals/load_result.json
@@ -176,6 +176,7 @@
             "schema": [
                 {
                     "type": "array",
+                    "minItems": 1,
                     "items": {
                         "type": "string",
                         "subtype": "band-name"
@@ -198,4 +199,4 @@
             "subtype": "raster-cube"
         }
     }
-}
\ No newline at end of file
+}