diff --git a/src/Core/OpenGL/CIndexBuffer.h b/src/Core/OpenGL/CIndexBuffer.h
index 43d71e3a..acf02f80 100644
--- a/src/Core/OpenGL/CIndexBuffer.h
+++ b/src/Core/OpenGL/CIndexBuffer.h
@@ -14,7 +14,7 @@ class CIndexBuffer
 
 public:
     CIndexBuffer();
-    CIndexBuffer(GLenum Type);
+    explicit CIndexBuffer(GLenum Type);
     ~CIndexBuffer();
     void AddIndex(uint16 Index);
     void AddIndices(uint16 *pIndices, uint Count);