diff --git a/benchtests/scripts/benchout_strings.schema.json b/benchtests/scripts/benchout_strings.schema.json
index 7c9a67134b..bfd9b4e6c0 100644
--- a/benchtests/scripts/benchout_strings.schema.json
+++ b/benchtests/scripts/benchout_strings.schema.json
@@ -28,7 +28,12 @@
 		    "items": {"type": "number"}
                    }
 		 },
-		 "additionalProperties": {"type": "number"},
+		 "additionalProperties": {
+		   "oneOf": [
+		     { "type": "number" },
+		     { "type": "string" }
+		   ]
+		 },
 		 "minProperties": 2
 	      }
 	    }