diff --git a/dwarf/cursor.cc b/dwarf/cursor.cc
index 19902da..f5a4193 100644
--- a/dwarf/cursor.cc
+++ b/dwarf/cursor.cc
@@ -86,7 +86,9 @@ cursor::string(std::string &out)
         size_t size;
         const char *p = this->cstr(&size);
         out.resize(size);
-        memmove(&out.front(), p, size);
+		if (size > 0) {
+			memmove(&out.front(), p, size);
+		}
 }
 
 const char *