@@ -171,11 +171,15 @@
 			}
 
 			lappend args $var
 		}
 
-		set adefs_c [join $adefs_c {, }]
+		if {[llength $adefs_c] == 0} {
+			set adefs_c "void"
+		} else {
+			set adefs_c [join $adefs_c {, }]
+		}
 
 		# Determine how to return in failure
 		if {$rtype != "void"} {
 			if {[info exists returnErrorValue]} {
 				set return_failure "return(${returnErrorValue})"