diff --git a/libs/openzap/src/ozmod/ozmod_isdn/ozmod_isdn.c b/libs/openzap/src/ozmod/ozmod_isdn/ozmod_isdn.c
index 68e727ee3d..e4e9a1511f 100644
--- a/libs/openzap/src/ozmod/ozmod_isdn/ozmod_isdn.c
+++ b/libs/openzap/src/ozmod/ozmod_isdn/ozmod_isdn.c
@@ -31,6 +31,13 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+/**
+ * Workaround for missing u_int / u_short types on solaris
+ */
+#if defined(HAVE_LIBPCAP) && defined(__SunOS)
+#define __EXTENSIONS__
+#endif
+
 #include "openzap.h"
 #include "Q931.h"
 #include "Q921.h"
@@ -53,9 +60,6 @@
 #ifdef HAVE_LIBPCAP
 /*-------------------------------------------------------------------------*/
 /*Q931ToPcap functions*/
-#ifndef WIN32
-#include <sys/socket.h>
-#endif
 #include <pcap.h>
 #endif