diff --git a/src/interfaces/ecpg/ecpglib/extern.h b/src/interfaces/ecpg/ecpglib/extern.h
index 846e205d281..ef4461bc184 100644
--- a/src/interfaces/ecpg/ecpglib/extern.h
+++ b/src/interfaces/ecpg/ecpglib/extern.h
@@ -125,7 +125,7 @@ PGresult  **ECPGdescriptor_lvalue(int line, const char *descriptor);
 bool ECPGstore_result(const PGresult *results, int act_field,
 				 const struct statement * stmt, struct variable * var);
 bool		ECPGstore_input(const int, const bool, const struct variable *, const char **, bool *);
-#if defined(__GNUC__) && (defined (__powerpc__) || defined(__AMD64__))
+#if defined(__GNUC__) && (defined (__powerpc__) || defined(__AMD64__) || defined(__x86_64__))
   // work around a gcc/ABI bug with va_lists on ppc+amd64
 void		ECPGget_variable(va_list, enum ECPGttype, struct variable *, bool);
 #else