diff --git a/udevtrigger.c b/udevtrigger.c
index 09ef60a..9479caa 100644
--- a/udevtrigger.c
+++ b/udevtrigger.c
@@ -358,6 +358,9 @@ int main(int argc, char *argv[], char *e
 {
 	int i;
 	int failed = 0;
+	int block = 1;
+	int bus = 1;
+	int class = 1;
 
 	logging_init("udevtrigger");
 	udev_config_init();
@@ -373,8 +376,15 @@ int main(int argc, char *argv[], char *e
 			dry_run = 1;
 		} else if (strcmp(arg, "--retry-failed") == 0 || strcmp(arg, "-F") == 0) {
 			failed = 1;
+		} else if (strcmp(arg, "--no-scan-block") == 0) {
+			block = 0;
+		} else if (strcmp(arg, "--no-scan-bus") == 0) {
+			bus = 0;
+		} else if (strcmp(arg, "--no-scan-class") == 0) {
+			class = 0;
 		} else if (strcmp(arg, "--help") == 0 || strcmp(arg, "-h") == 0) {
-			printf("Usage: udevtrigger [--help] [--verbose] [--dry-run] [--retry-failed]\n");
+			printf("Usage: udevtrigger [--no-scan-block] [--no-scan-bus] [--no-scan-class]\n");
+			printf("                   [--help] [--verbose] [--dry-run] [--retry-failed]\n");
 			goto exit;
 		} else {
 			fprintf(stderr, "unrecognized option '%s'\n", arg);
@@ -386,9 +396,12 @@ int main(int argc, char *argv[], char *e
 		scan_failed();
 	else {
 		/* default action */
-		scan_bus();
-		scan_class();
-		scan_block();
+		if (bus)
+			scan_bus();
+		if (class)
+			scan_class();
+		if (block)
+			scan_block();
 	}
 	exec_lists();