diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index a3cce33bed7..c5f7e23adcf 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -23,7 +23,9 @@
 #include <signal.h>
 #endif
 
+#ifdef MS_WINDOWS
 #include "malloc.h" /* for alloca */
+#endif
 
 #ifdef HAVE_LANGINFO_H
 #include <locale.h>