diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index 6724d05..be80cce 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -406,6 +406,35 @@
     return data;
 }
 
+#if defined(_WIN32)
+
+// TODO: move this to somewhere it can be shared.
+
+#include <windows.h>
+
+// Windows' tmpfile(3) requires administrator rights because
+// it creates temporary files in the root directory.
+static FILE* win32_tmpfile() {
+    char temp_path[PATH_MAX];
+    DWORD nchars = GetTempPath(sizeof(temp_path), temp_path);
+    if (nchars == 0 || nchars >= sizeof(temp_path)) {
+        fprintf(stderr, "GetTempPath failed, error %ld\n", GetLastError());
+        return nullptr;
+    }
+
+    char filename[PATH_MAX];
+    if (GetTempFileName(temp_path, "fastboot", 0, filename) == 0) {
+        fprintf(stderr, "GetTempFileName failed, error %ld\n", GetLastError());
+        return nullptr;
+    }
+
+    return fopen(filename, "w+bTD");
+}
+
+#define tmpfile win32_tmpfile
+
+#endif
+
 static int unzip_to_file(ZipArchiveHandle zip, char* entry_name) {
     FILE* fp = tmpfile();
     if (fp == NULL) {
diff --git a/fingerprintd/FingerprintDaemonProxy.cpp b/fingerprintd/FingerprintDaemonProxy.cpp
index 4f35520..a8a4024 100644
--- a/fingerprintd/FingerprintDaemonProxy.cpp
+++ b/fingerprintd/FingerprintDaemonProxy.cpp
@@ -123,7 +123,7 @@
         int32_t timeout) {
     ALOG(LOG_VERBOSE, LOG_TAG, "enroll(gid=%d, timeout=%d)\n", groupId, timeout);
     if (tokenSize != sizeof(hw_auth_token_t) ) {
-        ALOG(LOG_VERBOSE, LOG_TAG, "enroll() : invalid token size %" PRId64 "\n", tokenSize);
+        ALOG(LOG_VERBOSE, LOG_TAG, "enroll() : invalid token size %zu\n", tokenSize);
         return -1;
     }
     const hw_auth_token_t* authToken = reinterpret_cast<const hw_auth_token_t*>(token);
@@ -171,7 +171,7 @@
     char path_name[PATH_MAX];
     memcpy(path_name, path, pathlen);
     path_name[pathlen] = '\0';
-    ALOG(LOG_VERBOSE, LOG_TAG, "setActiveGroup(%d, %s, %" PRId64 ")", groupId, path_name, pathlen);
+    ALOG(LOG_VERBOSE, LOG_TAG, "setActiveGroup(%d, %s, %zu)", groupId, path_name, pathlen);
     return mDevice->set_active_group(mDevice, groupId, path_name);
     return -1;
 }