diff --git a/tools/gencromfs.c b/tools/gencromfs.c
index 5781b727ffd..c6801fdfe2f 100644
--- a/tools/gencromfs.c
+++ b/tools/gencromfs.c
@@ -1335,7 +1335,7 @@ int main(int argc, char **argv, char **envp)
   /* Now append the volume header to output file */
 
   fprintf(g_outstream, "/* CROMFS image */\n\n");
-  fprintf(g_outstream, "uint8_t g_cromfs_image[] =\n");
+  fprintf(g_outstream, "const uint8_t g_cromfs_image[] =\n");
   fprintf(g_outstream, "{\n");
   fprintf(g_outstream, "\n  /* Offset %6lu:  Volume header */\n\n", 0ul);