diff --git a/win32/include/_mingw.h b/win32/include/_mingw.h
index 295b689f..bbac35e2 100644
--- a/win32/include/_mingw.h
+++ b/win32/include/_mingw.h
@@ -57,6 +57,8 @@ typedef unsigned __int64 uintptr_t;
 #define __stdcall
 #define _AMD64_ 1
 #define __x86_64 1
+#define USE_MINGW_SETJMP_TWO_ARGS
+#define mingw_getsp tinyc_getsp
 #else
 typedef __int32 intptr_t;
 typedef unsigned __int32 uintptr_t;
diff --git a/win32/lib/chkstk.S b/win32/lib/chkstk.S
index 9be95978..90a6f0dc 100644
--- a/win32/lib/chkstk.S
+++ b/win32/lib/chkstk.S
@@ -56,6 +56,14 @@ P0:
     mov     (%rax),%rcx     /* restore ecx */
     jmp     *8(%rax)
 
+/* ---------------------------------------------- */
+/* avoid msvcrt unwind stuff for setjmp/longjmp */
+
+.globl tinyc_getsp
+tinyc_getsp:
+    xor %rax,%rax
+    ret
+
 /* ---------------------------------------------- */
 #endif
 /* ---------------------------------------------- */