diff --git a/Lib/r/rrun.swg b/Lib/r/rrun.swg
index 459d74913..55a5d7de2 100644
--- a/Lib/r/rrun.swg
+++ b/Lib/r/rrun.swg
@@ -1,4 +1,8 @@
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* Remove global namespace pollution */
 #if !defined(SWIG_NO_R_NO_REMAP)
 # define R_NO_REMAP
@@ -8,10 +12,6 @@
 #include <Rversion.h>
 #include <stdlib.h>
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 #define SWIGR 1
 
 #if R_VERSION >= R_Version(2,6,0)