diff --git a/libpsargs/libpsargs.c b/libpsargs/libpsargs.c
index 32a2a25..b019767 100644
--- a/libpsargs/libpsargs.c
+++ b/libpsargs/libpsargs.c
@@ -18,7 +18,7 @@ check_arg(char **args){
 	for(s = UNINITIALIZED, terms = 0; *args != NULL; ++args)
 		switch(s){
 		case UNINITIALIZED: case NORMAL:
-			if(SCMPFLAT(*args, l))
+			if(SCMPFLAT(*args, L_PAREN))
 				s = INLPAREN;
 			else
 				return 0; /* syntax error */