diff --git a/src/storage/storage_backend_logical.c b/src/storage/storage_backend_logical.c
index 203fe5d8712b870b9558ccc960bd3f85aa89214d..389ecd7e5dd10cf31301342ee231eb44b4184547 100644
--- a/src/storage/storage_backend_logical.c
+++ b/src/storage/storage_backend_logical.c
@@ -604,7 +604,10 @@ virStorageBackendLogicalCreateVol(virConnectPtr conn,
         cmdargv = cmdargvsnap;
     }
 
-    snprintf(size, sizeof(size)-1, "%lluK", vol->capacity/1024);
+    unsigned long long int capacity;
+    capacity = (vol->capacity + 1023) /1024;
+
+    snprintf(size, sizeof(size)-1, "%lluK", capacity);
     size[sizeof(size)-1] = '\0';
 
     vol->type = VIR_STORAGE_VOL_BLOCK;