diff --git a/gfileutils.c b/gfileutils.c
index e983a1dad..857e069ac 100644
--- a/gfileutils.c
+++ b/gfileutils.c
@@ -56,6 +56,10 @@
 #define S_ISLNK(x) 0
 #endif
 
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
 #define _(x) x
 
 /**
diff --git a/glib/gfileutils.c b/glib/gfileutils.c
index e983a1dad..857e069ac 100644
--- a/glib/gfileutils.c
+++ b/glib/gfileutils.c
@@ -56,6 +56,10 @@
 #define S_ISLNK(x) 0
 #endif
 
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
 #define _(x) x
 
 /**
diff --git a/glib/gutils.c b/glib/gutils.c
index 6cb914143..fac67375d 100644
--- a/glib/gutils.c
+++ b/glib/gutils.c
@@ -76,10 +76,6 @@
 #include <langinfo.h>
 #endif
 
-#ifndef O_BINARY
-#define O_BINARY 0
-#endif
-
 const guint glib_major_version = GLIB_MAJOR_VERSION;
 const guint glib_minor_version = GLIB_MINOR_VERSION;
 const guint glib_micro_version = GLIB_MICRO_VERSION;
diff --git a/gutils.c b/gutils.c
index 6cb914143..fac67375d 100644
--- a/gutils.c
+++ b/gutils.c
@@ -76,10 +76,6 @@
 #include <langinfo.h>
 #endif
 
-#ifndef O_BINARY
-#define O_BINARY 0
-#endif
-
 const guint glib_major_version = GLIB_MAJOR_VERSION;
 const guint glib_minor_version = GLIB_MINOR_VERSION;
 const guint glib_micro_version = GLIB_MICRO_VERSION;