1 files changed, 1 insertions, 1 deletions

diff --git a/scripts/dtc/treesource.c b/scripts/dtc/treesource.c
index ebeb6eb2790..1521ff11bb9 100644
--- a/scripts/dtc/treesource.c
+++ b/scripts/dtc/treesource.c
@@ -52,7 +52,7 @@ static void write_prefix(FILE *f, int level)
                 fputc('\t', f);
 }
 
-int isstring(char c)
+static int isstring(char c)
 {
         return (isprint(c)
                 || (c == '\0')