diff --git a/ilsp/bicep_lsp/modules.py b/ilsp/bicep_lsp/modules.py
index 588dd65..a98841f 100644
--- a/ilsp/bicep_lsp/modules.py
+++ b/ilsp/bicep_lsp/modules.py
@@ -129,9 +129,11 @@ class BicepModuleCatalog:
 
         Matches both new-style ('modules/appservice', 'util/types') and old-style
         bare names ('appservice') so completions work regardless of module version.
+        Case-insensitive to handle catalog lowercase vs. camelCase in .bicep files.
         """
+        ref_lower = ref_path.lower()
         for mod in cls._modules:
-            if mod["ref_path"] == ref_path or mod["name"] == ref_path:
+            if mod["ref_path"].lower() == ref_lower or mod["name"].lower() == ref_lower:
                 return mod
         return None