diff --git a/include/libbb.h b/include/libbb.h
index 05927f1..67cf493 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -442,6 +442,7 @@
 #endif
 # define VC_FORMAT "/dev/vc/%d"
 # define LOOP_FORMAT "/dev/loop/%d"
+# define LOOP_NAME "/dev/loop/"
 # define FB_0 "/dev/fb/0"
 #else
 # define CURRENT_VC "/dev/tty0"
@@ -461,6 +462,7 @@
 #endif
 # define VC_FORMAT "/dev/tty%d"
 # define LOOP_FORMAT "/dev/loop%d"
+# define LOOP_NAME "/dev/loop"
 # define FB_0 "/dev/fb0"
 #endif
 
diff --git a/util-linux/losetup.c b/util-linux/losetup.c
index 6b9a810..54a1601 100644
--- a/util-linux/losetup.c
+++ b/util-linux/losetup.c
@@ -48,11 +48,11 @@
 		printf("%s: %s\n", argv[0], s);
 		if (ENABLE_FEATURE_CLEAN_UP) free(s);
 	} else {
-		char dev[11] = "/dev/loop0";
+		char dev[sizeof(LOOP_NAME"0")] = LOOP_NAME"0";
 		char c;
 		for (c = '0'; c <= '9'; ++c) {
 			char *s;
-			dev[9] = c;
+			dev[sizeof(LOOP_NAME"0")-2] = c;
 			s = query_loop(dev);
 			if (s) {
 				printf("%s: %s\n", dev, s);