diff --git a/shared/utils/check_env.py b/shared/utils/check_env.py
index d35d23c..61af197 100644
--- a/shared/utils/check_env.py
+++ b/shared/utils/check_env.py
@@ -10,6 +10,9 @@ def check_env(
     assert isinstance(var_list, set)
     assert all(isinstance(elem, str) for elem in var_list)
     # check that env vars are set
+    missing_vars = []
     for env_var in var_list:
         if env_var not in os.environ:
-            raise OSError(f"environment variable not set: {env_var}")
+            missing_vars.append(env_var)
+    if len(missing_vars) > 0:
+        raise OSError(f"environment variable(s) not set: {missing_vars}")