diff --git a/arch/nt64/bits/signal.h b/arch/nt64/bits/signal.h
index b3a7616..e3c3141 100644
--- a/arch/nt64/bits/signal.h
+++ b/arch/nt64/bits/signal.h
@@ -1,6 +1,11 @@
 #if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
  || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 
+#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+#define MINSIGSTKSZ 2048
+#define SIGSTKSZ 8192
+#endif
+
 #ifdef _GNU_SOURCE
 #define REG_R8          0
 #define REG_R9          1