diff --git a/src/pulsecore/memtrap.c b/src/pulsecore/memtrap.c
index a6ae510f2..e04e838e6 100644
--- a/src/pulsecore/memtrap.c
+++ b/src/pulsecore/memtrap.c
@@ -129,7 +129,7 @@ static void memtrap_link(pa_memtrap *m, unsigned j) {
     memtraps[j] = m;
 }
 
-static void memtrap_unlink(pa_memtrap *m, int j) {
+static void memtrap_unlink(pa_memtrap *m, unsigned j) {
     pa_assert(m);
 
     if (m->next[j])