diff --git a/src/core/NotePlayHandle.cpp b/src/core/NotePlayHandle.cpp
index c71020034..b2a80a625 100644
--- a/src/core/NotePlayHandle.cpp
+++ b/src/core/NotePlayHandle.cpp
@@ -542,5 +542,5 @@ void NotePlayHandle::resize( const bpm_t _new_tempo )
 	}
 }
 
-const int INITIAL_NPH_CACHE = 256;
+const size_t INITIAL_NPH_CACHE = 256;
 MemoryPool<NotePlayHandle> NotePlayHandlePool{INITIAL_NPH_CACHE};