diff --git a/src/libCom/osi/os/solaris/osdSock.h b/src/libCom/osi/os/solaris/osdSock.h
index 872a08df5..96ea2a983 100644
--- a/src/libCom/osi/os/solaris/osdSock.h
+++ b/src/libCom/osi/os/solaris/osdSock.h
@@ -42,7 +42,7 @@ typedef int osiSockIoctl_t;
 #else
     typedef int osiSocklen_t;
 #endif
-typedef int osiSockOptMcastLoop_t;
+typedef char osiSockOptMcastLoop_t;
 
 #define DOES_NOT_ACCEPT_ZERO_LENGTH_UDP