diff --git a/include/SDL_config.h.in b/include/SDL_config.h.in
index 58593ca2a..cf947f4c0 100644
--- a/include/SDL_config.h.in
+++ b/include/SDL_config.h.in
@@ -131,6 +131,7 @@
 #undef HAVE_VSNPRINTF
 #undef HAVE_ICONV
 #undef HAVE_SIGACTION
+#undef HAVE_SA_SIGACTION
 #undef HAVE_SETJMP
 #undef HAVE_NANOSLEEP
 #undef HAVE_CLOCK_GETTIME