diff --git a/nsock/src/configure b/nsock/src/configure
index a86df8b38..f0d3cd22c 100755
--- a/nsock/src/configure
+++ b/nsock/src/configure
@@ -3534,6 +3534,7 @@ if test "${with_libpcap+set}" = set; then :
 if test "x$ac_cv_header_pcap_h" = xyes; then :
 
       have_libpcap=yes
+      LIBPCAP_LIBS=-lpcap
 fi
 
 
diff --git a/nsock/src/configure.ac b/nsock/src/configure.ac
index 75f8ee5e3..1772e9da8 100644
--- a/nsock/src/configure.ac
+++ b/nsock/src/configure.ac
@@ -125,7 +125,8 @@ AC_HELP_STRING([--without-libpcap], [Disable pcap functions.]),
 [  case "$with_libpcap" in
   yes)
     AC_CHECK_HEADER(pcap.h,[
-      have_libpcap=yes ])
+      have_libpcap=yes
+      LIBPCAP_LIBS=-lpcap ])
     ;;
   included)
     have_libpcap=no