diff --git a/src/configure b/src/configure
index 825dad34d9..7dd3d644b5 100755
--- a/src/configure
+++ b/src/configure
@@ -576,7 +576,7 @@ case "$host_os" in
     dgux*) PORTNAME='dgux';;
      aix*) PORTNAME='aix';;
 nextstep*) PORTNAME='nextstep';;
-  ultrix*) PORTNAME='ultrix';;
+  ultrix*) PORTNAME='ultrix4';;
 *) echo ""
    echo "*************************************************************"
    echo "configure does not currently recognize your operating system,"
diff --git a/src/configure.in b/src/configure.in
index 0ebfdba484..4d14bac442 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -13,7 +13,7 @@ case "$host_os" in
     dgux*) PORTNAME='dgux';;
      aix*) PORTNAME='aix';;
 nextstep*) PORTNAME='nextstep';;
-  ultrix*) PORTNAME='ultrix';;
+  ultrix*) PORTNAME='ultrix4';;
 *) echo ""
    echo "*************************************************************"
    echo "configure does not currently recognize your operating system,"