diff --git a/bt-host.c b/bt-host.c
index 042a55e47e6a10079df838f5aa964be2a209633a..3c7b270dffc47394c4b9ac712dd0fcf322f2c76d 100644
--- a/bt-host.c
+++ b/bt-host.c
@@ -200,7 +200,7 @@ struct HCIInfo *bt_host_hci(const char *id)
 #else
 struct HCIInfo *bt_host_hci(const char *id)
 {
-    fprintf(stderr, "qemu: bluetooth passthrough not supported (yet)\n", errno);
+    fprintf(stderr, "qemu: bluetooth passthrough not supported (yet)\n");
 
     return 0;
 }
diff --git a/exec.c b/exec.c
index ef1072b6dd63c69a7ad568759c1f401c3986d464..1edc737da580dbbdd73642f351ce368f3bff6258 100644
--- a/exec.c
+++ b/exec.c
@@ -234,7 +234,6 @@ static void page_init(void)
 #ifdef _WIN32
     {
         SYSTEM_INFO system_info;
-        DWORD old_protect;
 
         GetSystemInfo(&system_info);
         qemu_real_host_page_size = system_info.dwPageSize;
diff --git a/tap-win32.c b/tap-win32.c
index bfec14578a51c23286215d3f53c018372c60d67e..299b4b3225779e6fc3e7162d1f176b222c6fec53 100644
--- a/tap-win32.c
+++ b/tap-win32.c
@@ -77,7 +77,7 @@
 // Compile time configuration
 //======================
 
-//#define DEBUG_TAP_WIN32 1
+//#define DEBUG_TAP_WIN32
 
 #define TUN_ASYNCHRONOUS_WRITES 1
 
@@ -509,7 +509,7 @@ static DWORD WINAPI tap_win32_thread_entry(LPVOID param)
                 result = GetOverlappedResult( overlapped->handle, &overlapped->read_overlapped,
                                               &read_size, FALSE);
                 if (!result) {
-#if DEBUG_TAP_WIN32
+#ifdef DEBUG_TAP_WIN32
                     LPVOID lpBuffer;
                     dwError = GetLastError();
                     FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
@@ -520,7 +520,7 @@ static DWORD WINAPI tap_win32_thread_entry(LPVOID param)
 #endif
                 }
             } else {
-#if DEBUG_TAP_WIN32
+#ifdef DEBUG_TAP_WIN32
                 LPVOID lpBuffer;
                 FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
                                NULL, dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),