diff --git a/implot.h b/implot.h
index 997d96f..fb1ff02 100644
--- a/implot.h
+++ b/implot.h
@@ -45,6 +45,9 @@
 // [SECTION] Obsolete API
 
 #pragma once
+#ifndef IMGUI_DEFINE_MATH_OPERATORS
+#define IMGUI_DEFINE_MATH_OPERATORS
+#endif
 #include "imgui.h"
 
 //-----------------------------------------------------------------------------