diff -Naur a/core/src/droplet/libdroplet/src/backend/posix/backend.c b/core/src/droplet/libdroplet/src/backend/posix/backend.c
--- a/core/src/droplet/libdroplet/src/backend/posix/backend.c	2021-12-21 12:00:49.000000000 +0100
+++ b/core/src/droplet/libdroplet/src/backend/posix/backend.c	2022-03-10 08:53:14.873899783 +0100
@@ -144,7 +144,7 @@
     goto end;
   }
 
-  snprintf(buf, sizeof(buf), "%ld", st.st_nlink);
+  snprintf(buf, sizeof(buf), "%"PRIuMAX, (uintmax_t)st.st_nlink);
   ret2 = dpl_dict_add(metadata, "nlink", buf, 0);
   if (DPL_SUCCESS != ret2) {
     ret = ret2;
@@ -179,7 +179,7 @@
     goto end;
   }
 
-  snprintf(buf, sizeof(buf), "%lu", st.st_blksize);
+  snprintf(buf, sizeof(buf), "%"PRIuMAX, (uintmax_t)st.st_blksize);
   ret2 = dpl_dict_add(metadata, "blksize", buf, 0);
   if (DPL_SUCCESS != ret2) {
     ret = ret2;