diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 8eff4b36dc1..ac064a01c45 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -67,6 +67,10 @@
 	* vmsdbgout.c (vmsdbgout_init): Rename main_input_filename to filename.
 	(vmsdbgout_finish): Likewise.
 
+	PR target/47097
+	* config/i386/lynx.h (DBX_REGISTER_NUMBER): Add cast to avoid
+	mixing signed and unsigned types in conditional expression.
+
 2010-12-29  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/47074
diff --git a/gcc/config/i386/lynx.h b/gcc/config/i386/lynx.h
index cd8386231a3..a8ee3567a61 100644
--- a/gcc/config/i386/lynx.h
+++ b/gcc/config/i386/lynx.h
@@ -51,7 +51,7 @@ along with GCC; see the file COPYING3.  If not see
    : (n) == 5 ? 7							\
    : (n) == 6 ? 5							\
    : (n) == 7 ? 4							\
-   : ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n) + 8	\
+   : ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (int) (n) + 8	\
    : (-1))
   
 /* A C statement to output to the stdio stream FILE an assembler