diff --git a/Lib/r/rrun.swg b/Lib/r/rrun.swg
index f2c14a574..81f6461d2 100644
--- a/Lib/r/rrun.swg
+++ b/Lib/r/rrun.swg
@@ -20,6 +20,7 @@ extern "C" {
 #define SWIG_ConvertPtrAndOwn(obj,pptr,type,flags,own)  SWIG_R_ConvertPtr(obj, pptr, type, flags)
 #define SWIG_NewPointerObj(ptr, type, flags)            SWIG_R_NewPointerObj(ptr, type, flags)
 
+#include <stdio.h>
 #include <stdlib.h>
 #include <assert.h>