diff --git a/src/ptrace/_UPT_internal.h b/src/ptrace/_UPT_internal.h
index 27149d36..2283dc41 100644
--- a/src/ptrace/_UPT_internal.h
+++ b/src/ptrace/_UPT_internal.h
@@ -54,6 +54,6 @@ struct UPT_info
     struct elf_dyn_info edi;
   };
 
-extern int _UPT_reg_offset[UNW_REG_LAST + 1];
+extern const int _UPT_reg_offset[UNW_REG_LAST + 1];
 
 #endif /* _UPT_internal_h */
diff --git a/src/ptrace/_UPT_reg_offset.c b/src/ptrace/_UPT_reg_offset.c
index a59c852b..765f7d56 100644
--- a/src/ptrace/_UPT_reg_offset.c
+++ b/src/ptrace/_UPT_reg_offset.c
@@ -31,7 +31,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
 # include <asm/ptrace_offsets.h>
 #endif
 
-int _UPT_reg_offset[UNW_REG_LAST + 1] =
+const int _UPT_reg_offset[UNW_REG_LAST + 1] =
   {
 #ifdef HAVE_ASM_PTRACE_OFFSETS_H
 # ifndef PT_AR_CSD