diff --git a/imgui_draw.cpp b/imgui_draw.cpp
index 2c937e59..7a5bb2de 100644
--- a/imgui_draw.cpp
+++ b/imgui_draw.cpp
@@ -22,6 +22,9 @@
 #if !defined(alloca)
 #ifdef _WIN32
 #include <malloc.h>     // alloca
+#if !defined(alloca)
+#define alloca _alloca  // for clang with MS Codegen
+#endif
 #elif defined(__GLIBC__) || defined(__sun)
 #include <alloca.h>     // alloca
 #else