diff --git a/src/dj.c b/src/dj.c
index e407500..db847bd 100644
--- a/src/dj.c
+++ b/src/dj.c
@@ -314,7 +314,12 @@ int main(int argc, char *argv[]){
 		while((c = getopt(argc, argv, "a:Ab:B:c:di:fhHqs:S:o:")) != -1)
 			switch(c){
 			case 'i': case 'o':
-				if(Io_fdopen(&ep[c == 'o'], optarg) != -1)
+				i = (c == 'o');
+				if(optarg[0] == '-' && optarg[1] == '\0'){ /* optarg == "-" */
+					ep[i].fd = (i == 0) ? STDIN_FILENO : STDOUT_FILENO;
+					ep[i].fn = (i == 0) ? stdin_name   : stdout_name;
+					break;
+				}else if(Io_fdopen(&ep[i], optarg) != -1)
 					break;
 				terminate(ep);
 				return oserr(optarg);