diff --git a/tests/cdemo-undef.test b/tests/cdemo-undef.test
index f38da0d..f333efe 100755
--- a/tests/cdemo-undef.test
+++ b/tests/cdemo-undef.test
@@ -30,7 +30,7 @@ func_cd "tests/cdemo"
 func_make_distclean
 func_configure "--disable-static"
 
-grep '^allow_undefined=.?unsupported.?$' ./libtool >/dev/null 2>&1 \
+grep '^allow_undefined_flag=.unsupported.$' ./libtool >/dev/null 2>&1 \
     && func_skip "$host doesn't support undefined symbols in shared libs"
 
 if test -f ./libtool; then
diff --git a/tests/tagdemo-undef.test b/tests/tagdemo-undef.test
index e67e4cc..bb866d4 100755
--- a/tests/tagdemo-undef.test
+++ b/tests/tagdemo-undef.test
@@ -31,7 +31,7 @@ func_cd "tests/tagdemo"
 func_make_distclean
 func_configure "--disable-static"
 
-grep '^allow_undefined=.?unsupported.?$' ./libtool >/dev/null 2>&1 \
+grep '^allow_undefined_flag=.unsupported.$' ./libtool >/dev/null 2>&1 \
     && func_skip "$host doesn't support undefined symbols in shared libs"
 
 if test -f ./libtool; then