diff --git a/src/lib-sieve/sieve-common.h b/src/lib-sieve/sieve-common.h
index 0a04fe11f603c1be59aaa6ba14583630492237cd..e79fb4da9336ecf9dbf11578581cb2d8c8136814 100644
--- a/src/lib-sieve/sieve-common.h
+++ b/src/lib-sieve/sieve-common.h
@@ -16,6 +16,7 @@ typedef uint32_t sieve_offset_t;
 typedef uint64_t sieve_number_t;
 
 #define SIEVE_MAX_NUMBER ((sieve_number_t)-1)
+#define SIEVE_PRI_NUMBER PRIu64
 
 /*
  * Forward declarations