diff --git a/base/stringutil.cpp b/base/stringutil.cpp
index 848993349e..f5a2675b18 100644
--- a/base/stringutil.cpp
+++ b/base/stringutil.cpp
@@ -38,7 +38,7 @@ void OutputDebugStringUTF8(const char *p) {
 #endif
 
 void StringTrimEndNonAlphaNum(char *str) {
-	int n = strlen(str);
+	ssize_t n = strlen(str);
 	while (!isalnum(str[n]) && n >= 0) {
 		str[n--] = '\0';
 	}
diff --git a/ext/libzip/mkstemp.c b/ext/libzip/mkstemp.c
index 62641f0af3..0dbaaf0572 100644
--- a/ext/libzip/mkstemp.c
+++ b/ext/libzip/mkstemp.c
@@ -61,7 +61,9 @@ _zip_mkstemp(wchar_t *path)
 _zip_mkstemp(char *path)
 #endif
 {
+#ifndef _WIN32
 	int fd;   
+#endif
 #ifdef UNICODE
 	wchar_t *start, *trv;
 	struct _stat sbuf;