diff --git a/ldid.cpp b/ldid.cpp
index c93a66a..237b1c7 100644
--- a/ldid.cpp
+++ b/ldid.cpp
@@ -555,6 +555,7 @@ static const uint8_t PageShift_(0x0c);
 static const uint32_t PageSize_(1 << PageShift_);
 
 static inline unsigned bytes(uint64_t value) {
+    if (!value) return 1;
     return (64 - __builtin_clzll(value) + 7) / 8;
 }