diff --git a/desmume/src/libretro-common/file/file_path.c b/desmume/src/libretro-common/file/file_path.c
index 8836538b7..21e7f1e51 100644
--- a/desmume/src/libretro-common/file/file_path.c
+++ b/desmume/src/libretro-common/file/file_path.c
@@ -20,6 +20,12 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
+#ifdef __MACH__
+#define _DARWIN_C_SOURCE    /* As below, plus strl* functions */
+#else
+#define _XOPEN_SOURCE 500   /* For strdup, realpath */
+#endif
+
 #include <stdlib.h>
 #include <boolean.h>
 #include <string.h>
@@ -31,7 +37,6 @@
 #include <file/file_path.h>
 
 #ifndef __MACH__
-#define _XOPEN_SOURCE 500   /* For strdup, realpath */
 #include <compat/strl.h>
 #include <compat/posix_string.h>
 #endif