diff --git a/VistaCoreLibs/VistaOGLExt/Rendering/ABuffer/VistaABufferOIT.cpp b/VistaCoreLibs/VistaOGLExt/Rendering/ABuffer/VistaABufferOIT.cpp
index c972924e82ee04919278facfb1a67f4ffaf012f2..ca8da0928693eb39867f08da9e71bfe066b55dc9 100644
--- a/VistaCoreLibs/VistaOGLExt/Rendering/ABuffer/VistaABufferOIT.cpp
+++ b/VistaCoreLibs/VistaOGLExt/Rendering/ABuffer/VistaABufferOIT.cpp
@@ -141,7 +141,7 @@ bool VistaABufferOIT::Init(
 		break;
 	default:
 		vstr::errp() << "[VistaABufferOIT] unknown A-Buffer-Implementation" << std::endl;
-		return NULL;
+		return false;
 	}