diff --git a/src/jansson.h b/src/jansson.h
index 55c03d7..405c840 100644
--- a/src/jansson.h
+++ b/src/jansson.h
@@ -53,7 +53,11 @@ typedef struct {
 } json_t;
 
 #if JSON_INTEGER_IS_LONG_LONG
+#ifdef _WIN32
+#define JSON_INTEGER_FORMAT "I64d"
+#else
 #define JSON_INTEGER_FORMAT "lld"
+#endif
 typedef long long json_int_t;
 #else
 #define JSON_INTEGER_FORMAT "ld"