diff --git a/common/jpeg/jchuff.c b/common/jpeg/jchuff.c
index e40cfe3..b05c8e7 100644
--- a/common/jpeg/jchuff.c
+++ b/common/jpeg/jchuff.c
@@ -384,7 +384,7 @@
   put_buffer = (put_buffer << size) | code;                     \
  }
 
-#if __WORDSIZE==64
+#if __WORDSIZE==64 || defined(_WIN64)
 
 #define DUMP_BITS(code, size) {                                 \
   CHECKBUF47()                                                  \
@@ -425,7 +425,7 @@
 
 int _max=0;
 
-#if __WORDSIZE==64
+#if __WORDSIZE==64 || defined(_WIN64)
 
 #define DUMP_VALUE(ht, codevalue, t, nbits) { \
   size = ht->ehufsi[codevalue];               \