diff --git a/test/elf/warn-once.sh b/test/elf/warn-once.sh
index 325c4fc35e..1a85dd5a3f 100755
--- a/test/elf/warn-once.sh
+++ b/test/elf/warn-once.sh
@@ -10,12 +10,12 @@ mold="$(pwd)/mold"
 t=out/test/elf/$testname
 mkdir -p $t
 
-cat <<EOF | $CC -c -xc -o $t/a.o -
+cat <<EOF | $CC -c -fPIC -xc -o $t/a.o -
 extern int foo;
 int x() { return foo; }
 EOF
 
-cat <<EOF | $CC -c -xc -o $t/b.o -
+cat <<EOF | $CC -c -fPIC -xc -o $t/b.o -
 extern int foo;
 int y() { return foo; }
 int main() {}