diff --git a/libusb/os/darwin_usb.c b/libusb/os/darwin_usb.c
index b0d8a8a..c2285cd 100644
--- a/libusb/os/darwin_usb.c
+++ b/libusb/os/darwin_usb.c
@@ -52,7 +52,7 @@ _Atomic int32_t initCount = ATOMIC_VAR_INIT(0);
 #include <libkern/OSAtomic.h>
 
 /* OSAtomicAdd32Barrier returns the new value */
-#define libusb_darwin_atomic_fetch_add(x, y) (OSAtomicAdd32Barrier(x, y) - y)
+#define libusb_darwin_atomic_fetch_add(x, y) (OSAtomicAdd32Barrier(y, x) - y)
 
 static volatile int32_t initCount = 0;
 #endif
diff --git a/libusb/version_nano.h b/libusb/version_nano.h
index ccf0669..1eb7fa8 100644
--- a/libusb/version_nano.h
+++ b/libusb/version_nano.h
@@ -1 +1 @@
-#define LIBUSB_NANO 11148
+#define LIBUSB_NANO 11149