diff --git a/common/jpeg/jdhuff.h b/common/jpeg/jdhuff.h
index a7c8188..b192e48 100644
--- a/common/jpeg/jdhuff.h
+++ b/common/jpeg/jdhuff.h
@@ -75,7 +75,7 @@
 
 #if __WORDSIZE == 64
 
-typedef long bit_buf_type;	/* type of bit-extraction buffer */
+typedef size_t bit_buf_type;	/* type of bit-extraction buffer */
 #define BIT_BUF_SIZE  64		/* size of buffer in bits */
 
 #else