diff --git a/tests/run.sh.in b/tests/run.sh.in
index 46bd9ed..e8651df 100644
--- a/tests/run.sh.in
+++ b/tests/run.sh.in
@@ -116,6 +116,10 @@ run_test "PKG_CONFIG_PATH=${selfdir}/lib1 ${1} --cflags-only-I --cflags-only-oth
 	'-I/usr/local/include'
 run_test "PKG_CONFIG_PATH=${selfdir}/lib1 ${1} --libs incomplete; echo $?" \
 	'0'
+run_test "PKG_CONFIG_PATH=${selfdir}/lib1 ${1} --cflags incomplete" \
+	' '
+run_test "PKG_CONFIG_PATH=${selfdir}/lib1 ${1} --libs incomplete" \
+	' '
 
 # 6) tests for builtins
 run_test "PKG_CONFIG_PATH=${selfdir}/lib1 ${1} --modversion pkg-config" \