diff --git a/sadump.c b/sadump.c
index 3178c4c..0d7a935 100644
--- a/sadump.c
+++ b/sadump.c
@@ -623,17 +623,21 @@ open_disk(char *file)
 int is_sadump(char *file)
 {
 	if (SADUMP_VALID()) {
-		if (sd->flags & SADUMP_DISKSET) {
-			if (!open_disk(file) || !add_disk(file)) {
-				(void) sadump_cleanup_sadump_data();
-				return FALSE;
-			}
-			return TRUE;
+
+		if (!(sd->flags & SADUMP_DISKSET)) {
+			if (CRASHDEBUG(1))
+				error(INFO, "sadump: does not support multiple"
+				      " file formats\n");
+			(void) sadump_cleanup_sadump_data();
+			return FALSE;
 		}
-		if (CRASHDEBUG(1))
-			error(INFO, "sadump: does not support multiple file formats\n");
-		(void) sadump_cleanup_sadump_data();
-		return FALSE;
+
+		if (!open_disk(file) || !add_disk(file)) {
+			(void) sadump_cleanup_sadump_data();
+			return FALSE;
+		}
+
+		return TRUE;
 	}
 
 	if (!open_dump_file(file) || !read_dump_header(file))