diff --git a/polygon/rest/base.py b/polygon/rest/base.py
index 6442215d..fc300f19 100644
--- a/polygon/rest/base.py
+++ b/polygon/rest/base.py
@@ -138,7 +138,7 @@ def _get_params(
                         or argname.endswith("_gt")
                         or argname.endswith("_gte")
                     ):
-                        argname = argname.replace("_", ".")
+                        argname = ".".join(argname.rsplit("_", 1))
                     params[argname] = val
 
         return params