diff --git a/findutils/grep.c b/findutils/grep.c
index a374e114d..ac55f19d1 100644
--- a/findutils/grep.c
+++ b/findutils/grep.c
@@ -167,7 +167,7 @@ extern int grep_main(int argc, char **argv)
 
 	/* If no files were specified, take input from stdin. Otherwise, we grep
 	 * through all the files specified. */
-	if (argv[optind+1] == NULL) {
+	if (argv[optind+1] == NULL || (strcmp(argv[optind+1], "-") == 0)) {
 		grep_file(stdin);
 	} else {
 		int i;
diff --git a/grep.c b/grep.c
index a374e114d..ac55f19d1 100644
--- a/grep.c
+++ b/grep.c
@@ -167,7 +167,7 @@ extern int grep_main(int argc, char **argv)
 
 	/* If no files were specified, take input from stdin. Otherwise, we grep
 	 * through all the files specified. */
-	if (argv[optind+1] == NULL) {
+	if (argv[optind+1] == NULL || (strcmp(argv[optind+1], "-") == 0)) {
 		grep_file(stdin);
 	} else {
 		int i;