diff --git a/elf/elf.h b/elf/elf.h
index 496f08d..960a3c3 100644
--- a/elf/elf.h
+++ b/elf/elf.h
@@ -371,7 +371,7 @@ typedef struct
 #define SHF_MASKPROC	     0xf0000000	/* Processor-specific */
 #define SHF_ORDERED	     (1 << 30)	/* Special ordering requirement
 					   (Solaris).  */
-#define SHF_EXCLUDE	     (1 << 31)	/* Section is excluded unless
+#define SHF_EXCLUDE	     (1U << 31)	/* Section is excluded unless
 					   referenced or allocated (Solaris).*/
 
 /* Section group handling.  */