diff --git a/md5.c b/md5.c
index 71dfc9b..2fbbeec 100644
--- a/md5.c
+++ b/md5.c
@@ -249,7 +249,7 @@ uint32_t MsiGetFileHashW(const char16_t *filename, uint32_t options,
 
     MD5Init(&ctx);
 
-    while ((retd = read(fd, buffer, sizeof(buffer)) > 0))
+    while ((retd = read(fd, buffer, sizeof(buffer))) > 0)
         MD5Update(&ctx, buffer, retd);
     if (retd < 0) {
         warnx("MsiGetFileHash(%s) -> ERROR_READ_FAULT", fname);