Silence warning about symbol redefinition.
diff --git a/src/elf32.h b/src/elf32.h
index d27646c..63fef83 100644
--- a/src/elf32.h
+++ b/src/elf32.h
@@ -1,7 +1,9 @@
 #ifndef elf32_h
 #define elf32_h
 
+#ifndef ELF_CLASS
 #define ELF_CLASS	ELFCLASS32
+#endif
 #include "elfxx.h"
 
 #endif /* elf32_h */
diff --git a/src/elf64.h b/src/elf64.h
index 8f22384..fd10ed8 100644
--- a/src/elf64.h
+++ b/src/elf64.h
@@ -1,7 +1,9 @@
 #ifndef elf64_h
 #define elf64_h
 
+#ifndef ELF_CLASS
 #define ELF_CLASS	ELFCLASS64
+#endif
 #include "elfxx.h"
 
 #endif /* elf64_h */