diff --git a/dev/fluids/R13I1.json b/dev/fluids/R13I1.json
index fbc4bf5a..b4d0b650 100644
--- a/dev/fluids/R13I1.json
+++ b/dev/fluids/R13I1.json
@@ -76,7 +76,7 @@
       "using_tau_r": false
     }
   }, 
-  "CAS": "2314-97-8 ", 
+  "CAS": "2314-97-8", 
   "ENVIRONMENTAL": {
     "ASHRAE34": "UNKNOWN", 
     "FH": -1,