diff --git a/src/metatrain/experimental/alchemical_model/schema-hypers.json b/src/metatrain/experimental/alchemical_model/schema-hypers.json
index 387a4f6ea..b5901c318 100644
--- a/src/metatrain/experimental/alchemical_model/schema-hypers.json
+++ b/src/metatrain/experimental/alchemical_model/schema-hypers.json
@@ -92,11 +92,8 @@
         },
         "loss_weights": {
           "type": "object",
-          "properties": {
-            "energy": {
-              "type": "number"
-            },
-            "forces": {
+          "patternProperties": {
+            ".*": {
               "type": "number"
             }
           },
diff --git a/src/metatrain/experimental/soap_bpnn/schema-hypers.json b/src/metatrain/experimental/soap_bpnn/schema-hypers.json
index 044f59729..2ce8a1b4e 100644
--- a/src/metatrain/experimental/soap_bpnn/schema-hypers.json
+++ b/src/metatrain/experimental/soap_bpnn/schema-hypers.json
@@ -134,11 +134,8 @@
         },
         "loss_weights": {
           "type": "object",
-          "properties": {
-            "energy": {
-              "type": "number"
-            },
-            "forces": {
+          "patternProperties": {
+            ".*": {
               "type": "number"
             }
           },