diff --git a/Lib/r/rrun.swg b/Lib/r/rrun.swg
index b5375c213..32946c7b5 100644
--- a/Lib/r/rrun.swg
+++ b/Lib/r/rrun.swg
@@ -16,8 +16,6 @@ extern "C" {
 #include <stdlib.h>
 #include <assert.h>
 
-#define SWIGR 1
-
 #if R_VERSION >= R_Version(2,6,0)
 #define VMAXTYPE void *
 #else