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-rw-r--r--rts/PosixSource.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/rts/PosixSource.h b/rts/PosixSource.h
index 56e08abb0e..da7b69e85d 100644
--- a/rts/PosixSource.h
+++ b/rts/PosixSource.h
@@ -25,6 +25,10 @@
// On both GNU libc and FreeBSD, _ISOC99_SOURCE is implied by
// _XOPEN_SOURCE==600, but on Solaris it is an error to omit it.
#define _ISOC99_SOURCE
+// Defining __USE_MINGW_ANSI_STDIO is the most portable way to tell
+// mingw that we want to use the standard %lld style format specifiers,
+// rather than the Windows %I64d style
+#define __USE_MINGW_ANSI_STDIO 1
#endif
#if defined(darwin_HOST_OS)