diff --git a/src/shader_dxbc.h b/src/shader_dxbc.h
index b3a7cc3d79..b9b04e831e 100644
--- a/src/shader_dxbc.h
+++ b/src/shader_dxbc.h
@@ -10,6 +10,13 @@
 
 #define DXBC_CHUNK_HEADER BX_MAKEFOURCC('D', 'X', 'B', 'C')
 
+#ifdef None
+// on linux when trying to build with vulkan on and opengl off, this file is included after Xlib.h
+// which includes X.h, which in turn #define None 0
+// undefining so DxbcOperandModifier::None properly compiles
+#undef None
+#endif /* #ifdef None */
+
 namespace bgfx
 {
 	struct DxbcOpcode