diff --git a/c/src/lib/libc/imfs_getchild.c b/c/src/lib/libc/imfs_getchild.c
index f70a8f292c..46dd709c8c 100644
--- a/c/src/lib/libc/imfs_getchild.c
+++ b/c/src/lib/libc/imfs_getchild.c
@@ -18,7 +18,7 @@
 #include "imfs.h"
 
 static char dotname[2] = ".";
-static char dotdotname[2] = "..";
+static char dotdotname[3] = "..";
 
 IMFS_jnode_t *IMFS_find_match_in_dir(
   IMFS_jnode_t *directory,