diff --git a/examples/netdump/netdump.c b/examples/netdump/netdump.c
index 91aa672..5f91317 100644
--- a/examples/netdump/netdump.c
+++ b/examples/netdump/netdump.c
@@ -43,7 +43,7 @@ int __cdecl main(int argc, char **argv)
     HANDLE handle, console;
     UINT i;
     INT16 priority = 0;
-    char packet[MAXBUF];
+    unsigned char packet[MAXBUF];
     UINT packet_len;
     WINDIVERT_ADDRESS addr;
     PWINDIVERT_IPHDR ip_header;
diff --git a/examples/netfilter/netfilter.c b/examples/netfilter/netfilter.c
index 914058c..49847f6 100644
--- a/examples/netfilter/netfilter.c
+++ b/examples/netfilter/netfilter.c
@@ -88,7 +88,7 @@ int __cdecl main(int argc, char **argv)
     HANDLE handle, console;
     UINT i;
     INT16 priority = 0;
-    char packet[MAXBUF];
+    unsigned char packet[MAXBUF];
     UINT packet_len;
     WINDIVERT_ADDRESS recv_addr, send_addr;
     PWINDIVERT_IPHDR ip_header;
diff --git a/examples/passthru/passthru.c b/examples/passthru/passthru.c
index dc9acfc..05fa862 100644
--- a/examples/passthru/passthru.c
+++ b/examples/passthru/passthru.c
@@ -91,7 +91,7 @@ int __cdecl main(int argc, char **argv)
 // Passthru thread.
 static DWORD passthru(LPVOID arg)
 {
-    char packet[MAXBUF];
+    unsigned char packet[MAXBUF];
     UINT packet_len;
     WINDIVERT_ADDRESS addr;
     HANDLE handle = (HANDLE)arg;