diff --git a/components/external/lodepng/lodepng.c b/components/external/lodepng/lodepng.c
index dff9ad79e2e9a0440e23b8021d8327fb4e808c5d..e9c440eb762b2f84a766f9014d401c34c6b72bcd 100644
--- a/components/external/lodepng/lodepng.c
+++ b/components/external/lodepng/lodepng.c
@@ -2267,7 +2267,7 @@ const LodePNGDecompressSettings lodepng_default_decompress_settings = {0, 0, 0,
 /* ////////////////////////////////////////////////////////////////////////// */
 
 /* CRC polynomial: 0xedb88320 */
-static unsigned lodepng_crc32_table[256] = {
+static unsigned const lodepng_crc32_table[256] = {
            0u, 1996959894u, 3993919788u, 2567524794u,  124634137u, 1886057615u, 3915621685u, 2657392035u,
    249268274u, 2044508324u, 3772115230u, 2547177864u,  162941995u, 2125561021u, 3887607047u, 2428444049u,
    498536548u, 1789927666u, 4089016648u, 2227061214u,  450548861u, 1843258603u, 4107580753u, 2211677639u,