diff --git a/src/os/solaris/solaris_sigar.c b/src/os/solaris/solaris_sigar.c
index 17912d04..560e43c8 100644
--- a/src/os/solaris/solaris_sigar.c
+++ b/src/os/solaris/solaris_sigar.c
@@ -23,6 +23,7 @@
 
 #include <inet/ip.h>
 #include <inet/tcp.h>
+#include <net/if.h>
 #include <net/route.h>
 #include <sys/lwp.h>
 #include <sys/proc.h>