diff --git a/configure.ac b/configure.ac
index 0bcff587e8a..33948fd7760 100644
--- a/configure.ac
+++ b/configure.ac
@@ -785,10 +785,7 @@ case "${canonical}" in
   *-nto-qnx* )
     opsys=qnxnto
     test -z "$CC" && CC=qcc
-    CFLAGS="$CFLAGS -D__NO_EXT_QNX"
-    if test "$with_unexec" = yes; then
-      LDFLAGS="-N2MB $LDFLAGS"
-    fi
+    LDFLAGS="-N2M $LDFLAGS"
   ;;
 
   ## Intel 386 machines where we don't care about the manufacturer.