diff --git a/tasmota/tasmota_support/support_jpeg.ino b/tasmota/tasmota_support/support_jpeg.ino
index 2ebce0e4c..632cb3c3f 100644
--- a/tasmota/tasmota_support/support_jpeg.ino
+++ b/tasmota/tasmota_support/support_jpeg.ino
@@ -66,7 +66,7 @@ typedef struct {
 } rgb_jpg_decoder;
 
 //input buffer
-static uint32_t _jpg_read(void * arg, size_t index, uint8_t *buf, size_t len)
+static size_t _jpg_read(void * arg, size_t index, uint8_t *buf, size_t len)
 {
     rgb_jpg_decoder * jpeg = (rgb_jpg_decoder *)arg;
     if(buf) {