diff --git a/modules/core/src/ocl.cpp b/modules/core/src/ocl.cpp
index 6a36ddbae..5d68a3683 100644
--- a/modules/core/src/ocl.cpp
+++ b/modules/core/src/ocl.cpp
@@ -3957,6 +3957,7 @@ public:
             derived()._releaseBufferEntry(entry);
         }
         reservedEntries_.clear();
+        currentReservedSize = 0;
     }
 };