1 files changed, 4 insertions, 3 deletions
diff --git a/lib/portability.h b/lib/portability.h
index 05a449ee..5886f63f 100644
--- a/lib/portability.h
+++ b/lib/portability.h
@@ -4,6 +4,10 @@
 // in specific compiler, library, or OS versions, localize all that here
 // and in portability.c
 
+// Always use long file support.
+// This must come before we #include any system header file to take effect!
+#define _FILE_OFFSET_BITS 64
+
 // For musl
 #define _ALL_SOURCE
 #include <regex.h>
@@ -30,9 +34,6 @@
 #define printf_format
 #endif
 
-// Always use long file support.
-#define _FILE_OFFSET_BITS 64
-
 // This isn't in the spec, but it's how we determine what libc we're using.
 
 // Types various replacement prototypes need.