diff --git a/libs/libc/libgen/lib_basename.c b/libs/libc/libgen/lib_basename.c
index 79cdc99e975..593d7e02698 100644
--- a/libs/libc/libgen/lib_basename.c
+++ b/libs/libc/libgen/lib_basename.c
@@ -60,7 +60,7 @@
 FAR char *basename(FAR char *path)
 {
   FAR char *p;
-  int       len;
+  size_t    len;
 
   /* Handle some corner cases */