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-rw-r--r--py/nlrx86.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/py/nlrx86.c b/py/nlrx86.c
index 58aaa1a57..8d15d7bab 100644
--- a/py/nlrx86.c
+++ b/py/nlrx86.c
@@ -35,7 +35,11 @@
// For reference, x86 callee save regs are:
// ebx, esi, edi, ebp, esp, eip
-#define NLR_OS_WINDOWS (defined(_WIN32) || defined(__CYGWIN__))
+#if defined(_WIN32) || defined(__CYGWIN__)
+#define NLR_OS_WINDOWS 1
+#else
+#define NLR_OS_WINDOWS 0
+#endif
#if NLR_OS_WINDOWS
unsigned int nlr_push_tail(nlr_buf_t *nlr) asm("nlr_push_tail");