diff --git a/src/ert/config/analysis_config.py b/src/ert/config/analysis_config.py
index af3346de7a7..a6fdf655f8e 100644
--- a/src/ert/config/analysis_config.py
+++ b/src/ert/config/analysis_config.py
@@ -81,6 +81,11 @@ def __init__(
             if var_name in ["INVERSION", "IES_INVERSION"]:
                 if value in inversion_str_map[module_name]:
                     value = inversion_str_map[module_name][value]
+                    if var_name == "IES_INVERSION":
+                        ConfigWarning.ert_context_warn(
+                            "IES_INVERSION is deprecated, please use INVERSION instead:\n"
+                            f"ANALYSIS_SET_VAR {module_name} INVERSION {value.upper()}"
+                        )
                 var_name = "inversion"
             key = var_name.lower()
             options[module_name][key] = value