diff --git a/programs/winetest/main.c b/programs/winetest/main.c
index 9623039..062f482 100644
--- a/programs/winetest/main.c
+++ b/programs/winetest/main.c
@@ -256,7 +256,7 @@ static void
 extract_test (struct wine_test *test, const char *dir, LPTSTR res_name)
 {
     BYTE* code;
-    DWORD size;
+    DWORD size = 0;
     char *exepos;
     HANDLE hfile;
     DWORD written;
diff --git a/programs/winetest/util.c b/programs/winetest/util.c
index 0253296..646ec03 100644
--- a/programs/winetest/util.c
+++ b/programs/winetest/util.c
@@ -97,7 +97,7 @@ char *strmake (size_t *lenp, ...)
 void xprintf (const char *fmt, ...)
 {
     va_list ap;
-    size_t size;
+    size_t size = 0;
     DWORD written;
     char *buffer, *head;