diff --git a/os/ex/ST/l3gd20.c b/os/ex/ST/l3gd20.c
index 60aeee8cf..49bd1f000 100644
--- a/os/ex/ST/l3gd20.c
+++ b/os/ex/ST/l3gd20.c
@@ -60,7 +60,7 @@
 static void l3gd20SPIReadRegister(SPIDriver *spip, uint8_t reg,  size_t n,
                                      uint8_t* b) {
   uint8_t cmd;
-  (n == 1) ? (cmd = reg) : (cmd = reg | L3GD20_RW | L3GD20_MS);
+  (n == 1) ? (cmd = reg | L3GD20_RW) : (cmd = reg | L3GD20_RW | L3GD20_MS);
   spiSelect(spip);
   spiSend(spip, 1, &cmd);
   spiReceive(spip, n, b);