diff --git a/profiles/osapi/linux.h b/profiles/osapi/linux.h
index 692bfac..e0d436a 100644
--- a/profiles/osapi/linux.h
+++ b/profiles/osapi/linux.h
@@ -24,7 +24,4 @@
 #define TANH_PRESERVES_ZERO_SIGN        1
 #define TIME_WITH_SYS_TIME              1
 
-/* compiler, toolchain, and abi */
-#define VA_LIST_IS_ARRAY                1
-
 #endif
diff --git a/profiles/osapi/modern.h b/profiles/osapi/modern.h
index 3cbea8c..8bd794c 100644
--- a/profiles/osapi/modern.h
+++ b/profiles/osapi/modern.h
@@ -1,6 +1,8 @@
 #ifndef PY_OSAPI_MODERN_H
 #define PY_OSAPI_MODERN_H
 
+#include <stdarg.h>
+
 /* atomics */
 #ifdef  __ATOMIC_ACQUIRE
 #define HAVE_BUILTIN_ATOMIC             1
@@ -287,6 +289,10 @@
 #define HAVE_GCC_ASM_FOR_X87            1
 #endif
 
+#ifndef __va_copy
+#define __va_copy                       va_copy
+#endif
+
 #define _BSD_TYPES                      1
 #define _DARWIN_C_SOURCE                1
 #define _FILE_OFFSET_BITS               64