diff --git a/libgo/runtime/proc.c b/libgo/runtime/proc.c
index 12c055d71ad79..0770e3390f737 100644
--- a/libgo/runtime/proc.c
+++ b/libgo/runtime/proc.c
@@ -12,6 +12,10 @@
 #include "config.h"
 
 #ifdef HAVE_DL_ITERATE_PHDR
+#ifdef __sun
+#undef _FILE_OFFSET_BITS
+#define _FILE_OFFSET_BITS 32
+#endif
 #include <link.h>
 #endif