diff --git a/common/env.c b/common/env.c
index 748b655..2e33eb3 100644
--- a/common/env.c
+++ b/common/env.c
@@ -258,7 +258,7 @@
 
 void export_env_ull(const char *name, unsigned long long val)
 {
-	char *valstr = asprintf("%lld", val);
+	char *valstr = asprintf("%llu", val);
 
 	setenv(name, valstr);
 	export(name);