diff --git a/py/builtinimport.c b/py/builtinimport.c
index 262ee04a53..4a2f6510c3 100644
--- a/py/builtinimport.c
+++ b/py/builtinimport.c
@@ -3,6 +3,10 @@
 #include <stdio.h>
 #include <string.h>
 #include <assert.h>
+#ifdef __MINGW32__
+// For alloca()
+#include <malloc.h>
+#endif
 
 #include "nlr.h"
 #include "misc.h"
diff --git a/py/objfun.c b/py/objfun.c
index c7144f3078..940b64a66e 100644
--- a/py/objfun.c
+++ b/py/objfun.c
@@ -2,6 +2,10 @@
 #include <stdlib.h>
 #include <string.h>
 #include <assert.h>
+#ifdef __MINGW32__
+// For alloca()
+#include <malloc.h>
+#endif
 
 #include "nlr.h"
 #include "misc.h"