diff --git a/libs/openzap/src/isdn/include/Q931ie.h b/libs/openzap/src/isdn/include/Q931ie.h
index 76633e1882..c5e4a31534 100644
--- a/libs/openzap/src/isdn/include/Q931ie.h
+++ b/libs/openzap/src/isdn/include/Q931ie.h
@@ -98,7 +98,7 @@ typedef enum {
 
 /* Variable Length Codeset 6 Information Elements */
 
-#define Q931ie_GENERIC_DIGITS  Q931_CODESET_6 | 0x37 /* 0011 0111       */
+#define Q931ie_GENERIC_DIGITS (Q931_CODESET_6 | 0x37) /* 0011 0111       */