diff --git a/test/config_info.cpp b/test/config_info.cpp
index e04a59fc..c86e0a85 100644
--- a/test/config_info.cpp
+++ b/test/config_info.cpp
@@ -194,6 +194,7 @@ void print_compiler_macros()
   PRINT_MACRO(__hp9000s700);
   PRINT_MACRO(_PA_RISC1_1);
   PRINT_MACRO(__HPUX_SOURCE);
+  PRINT_MACRO(_INCLUDE__STDC_A1_SOURCE);
   // SGI IRIX:
   PRINT_MACRO(__sgi);
   PRINT_MACRO(_COMPILER_VERSION);