diff --git a/libdnet-stripped/configure b/libdnet-stripped/configure
index 144c78577..baae3af1b 100755
--- a/libdnet-stripped/configure
+++ b/libdnet-stripped/configure
@@ -15219,7 +15219,7 @@ printf %s "checking for Linux PF_PACKET sockets... " >&6; }
 int
 main (void)
 {
-int foo() { return ETH_P_ALL; }
+int foo = ETH_P_ALL;
   ;
   return 0;
 }
diff --git a/libdnet-stripped/m4/acinclude.m4 b/libdnet-stripped/m4/acinclude.m4
index 2b94702cf..c84674c2b 100644
--- a/libdnet-stripped/m4/acinclude.m4
+++ b/libdnet-stripped/m4/acinclude.m4
@@ -149,7 +149,7 @@ AC_DEFUN([AC_DNET_LINUX_PF_PACKET],
     [AC_MSG_CHECKING(for Linux PF_PACKET sockets)
     AC_TRY_COMPILE([#include <netpacket/packet.h>
                     #include <linux/if_ether.h>],
-                   [int foo() { return ETH_P_ALL; }],
+                   [int foo = ETH_P_ALL;],
     ac_cv_dnet_linux_pf_packet=yes,
     ac_cv_dnet_linux_pf_packet=no)
     AC_MSG_RESULT($ac_cv_dnet_linux_pf_packet)