diff --git a/src/mca/mca.h b/src/mca/mca.h
index fa3213cfb2..d234401a82 100644
--- a/src/mca/mca.h
+++ b/src/mca/mca.h
@@ -12,7 +12,7 @@
  * Types for each function
  */
 
-typedef int (*mca_base_open_module_fn_t)(lam_cmd_line_t *cmd);
+typedef int (*mca_base_open_module_fn_t)(void);
 typedef int (*mca_base_close_module_fn_t)(void);