diff --git a/VERSION b/VERSION
index f109455d..5c92172e 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-8.3.670
+8.3.671
diff --git a/utils/signals.c b/utils/signals.c
index 482c4906..d99a7057 100644
--- a/utils/signals.c
+++ b/utils/signals.c
@@ -92,7 +92,7 @@ global bool SigIOReady = FALSE;
 
 /* If set to 1, we will set SigInterruptPending whenever we set SigIOReady. */
 /* If set to -1, then SigInterruptPending is never set */
-global char SigInterruptOnSigIO;
+global signed char SigInterruptOnSigIO;
 
 /*
  * Set to true when we recieve a SIGWINCH/SIGWINDOW signal
diff --git a/utils/signals.h b/utils/signals.h
index 58b7e2dd..c339542f 100644
--- a/utils/signals.h
+++ b/utils/signals.h
@@ -39,7 +39,7 @@
 /* data structures */
 extern bool SigInterruptPending;
 extern bool SigIOReady;
-extern char SigInterruptOnSigIO;
+extern signed char SigInterruptOnSigIO;
 extern bool SigGotSigWinch;
 
 /* procedures */