diff --git a/arangod/RestHandler/RestImportHandler.cpp b/arangod/RestHandler/RestImportHandler.cpp
index 965e6a9522..c2f4cde883 100644
--- a/arangod/RestHandler/RestImportHandler.cpp
+++ b/arangod/RestHandler/RestImportHandler.cpp
@@ -482,7 +482,7 @@ TRI_json_t* RestImportHandler::parseJsonLine (const string& line) {
 
   if (errmsg != 0) {
     // must free this error message, otherwise we'll have a memleak
-    TRI_FreeString(TRI_UNKNOWN_MEM_ZONE, errmsg);
+    TRI_FreeString(TRI_CORE_MEM_ZONE, errmsg);
   }
   return json;
 }
diff --git a/arangod/RestHandler/RestVocbaseBaseHandler.cpp b/arangod/RestHandler/RestVocbaseBaseHandler.cpp
index edea765409..b633d528b6 100644
--- a/arangod/RestHandler/RestVocbaseBaseHandler.cpp
+++ b/arangod/RestHandler/RestVocbaseBaseHandler.cpp
@@ -546,7 +546,7 @@ TRI_json_t* RestVocbaseBaseHandler::parseJsonBody () {
                     TRI_ERROR_HTTP_CORRUPTED_JSON,
                     errmsg);
 
-      TRI_FreeString(TRI_UNKNOWN_MEM_ZONE, errmsg);
+      TRI_FreeString(TRI_CORE_MEM_ZONE, errmsg);
     }
 
     return 0;