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-rw-r--r--includes/Rts.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/includes/Rts.h b/includes/Rts.h
index c1f4f05bea..89efb15d9d 100644
--- a/includes/Rts.h
+++ b/includes/Rts.h
@@ -168,7 +168,7 @@ void _assertFail(const char *filename, unsigned int linenum)
#define FMT_Word64 "lu"
#define FMT_Int64 "ld"
#else
-#if defined(mingw32_HOST_OS)
+#if defined(mingw32_HOST_OS) && defined(i386_HOST_ARCH)
/* mingw doesn't understand %llu/%lld - it treats them as 32-bit
rather than 64-bit */
#define FMT_Word64 "I64u"