diff --git a/pbs-api-types/src/datastore.rs b/pbs-api-types/src/datastore.rs
index 72e8d1ee..7f8c1f09 100644
--- a/pbs-api-types/src/datastore.rs
+++ b/pbs-api-types/src/datastore.rs
@@ -34,7 +34,7 @@ const_regex! {
     pub SNAPSHOT_PATH_REGEX = concat!(r"^", SNAPSHOT_PATH_REGEX_STR!(), r"$");
     pub GROUP_OR_SNAPSHOT_PATH_REGEX = concat!(r"^", GROUP_OR_SNAPSHOT_PATH_REGEX_STR!(), r"$");
 
-    pub DATASTORE_MAP_REGEX = concat!(r"(:?", PROXMOX_SAFE_ID_REGEX_STR!(), r"=)?", PROXMOX_SAFE_ID_REGEX_STR!());
+    pub DATASTORE_MAP_REGEX = concat!(r"^(:?", PROXMOX_SAFE_ID_REGEX_STR!(), r"=)?", PROXMOX_SAFE_ID_REGEX_STR!(), r"$");
 }
 
 pub const CHUNK_DIGEST_FORMAT: ApiStringFormat = ApiStringFormat::Pattern(&SHA256_HEX_REGEX);