diff --git a/src/hci_cmd.c b/src/hci_cmd.c
index 77f7cba89..6af233222 100644
--- a/src/hci_cmd.c
+++ b/src/hci_cmd.c
@@ -53,7 +53,7 @@
 #include <string.h>
 
 // calculate combined ogf/ocf value
-#define OPCODE(ogf, ocf) ((ocf) | (ogf) << 10)
+#define OPCODE(ogf, ocf) ((ocf) | ((ogf) << 10))
 
 /**
  * construct HCI Command based on template