diff --git a/configure b/configure
index 20a27a5d2..aea870011 100755
--- a/configure
+++ b/configure
@@ -5817,7 +5817,7 @@ _ACEOF
 else
   if test "${LIBPCAP_INC+set}" = "set"; then
     LDFLAGS="-L$libpcapdir $_ldflags"
-    CXXFLAGS="$_cflags -I$libpcapdir"
+    CXXFLAGS="$_cflags -I$LIBPCAP_INC"
   else
     LDFLAGS="-L$libpcapdir $LDFLAGS"
     CXXFLAGS="$CXXFLAGS -I$libpcapdir"
diff --git a/configure.ac b/configure.ac
index 7174f8277..81d20fbbf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -376,7 +376,7 @@ if test $have_libpcap = yes; then
 else
   if test "${LIBPCAP_INC+set}" = "set"; then
     LDFLAGS="-L$libpcapdir $_ldflags"
-    CXXFLAGS="$_cflags -I$libpcapdir"
+    CXXFLAGS="$_cflags -I$LIBPCAP_INC"
   else
     LDFLAGS="-L$libpcapdir $LDFLAGS"
     CXXFLAGS="$CXXFLAGS -I$libpcapdir"