diff --git a/src/ftl_extract/matcher.py b/src/ftl_extract/matcher.py
index 65d3253..ea961fe 100644
--- a/src/ftl_extract/matcher.py
+++ b/src/ftl_extract/matcher.py
@@ -140,7 +140,7 @@ def visit_Call(self, node: ast.Call) -> None:  # noqa: N802
                 self.generic_visit(node)
 
         elif isinstance(node.func, ast.Name) and node.func.id in self.func_names:
-            if not node.args:
+            if not node.args or not isinstance(node.args[0], ast.Constant):
                 return
 
             fluent_key = create_fluent_key(