diff --git a/elfio/elf_types.hpp b/elfio/elf_types.hpp
index a83e2cf..63d025a 100644
--- a/elfio/elf_types.hpp
+++ b/elfio/elf_types.hpp
@@ -827,7 +827,7 @@ struct Elf64_Rela {
 
 #define ELF64_R_SYM(i)    ((i)>>32)
 #define ELF64_R_TYPE(i)   ((i)&0xffffffffL)
-#define ELF64_R_INFO(s,t) ((((int64_t)s)<<32)+((t)&0xffffffffL))
+#define ELF64_R_INFO(s,t) ((((int64_t)(s))<<32)+((t)&0xffffffffL))
 
 // Dynamic structure
 struct Elf32_Dyn {