diff --git a/xpdevplus.h.in b/xpdevplus.h.in
index 0cb63f640d5ff6bb4970c448284f93ab832344ec..be596abe3fcfab7364c11c935c847c4d80f50b76 100644
--- a/xpdevplus.h.in
+++ b/xpdevplus.h.in
@@ -7,7 +7,7 @@
 #define _BSD_SOURCE
 #define SPEED_MACROS_ONLY 
 #define _GNU_SOURCE 
-#define _FILE_OFFSET_BITS =64
+#define _FILE_OFFSET_BITS 64
 #endif
 
 #cmakedefine WITH_SDL