diff --git a/artiq/runtime/ksupport.c b/artiq/runtime/ksupport.c
index d11511bfb..60a8eb023 100644
--- a/artiq/runtime/ksupport.c
+++ b/artiq/runtime/ksupport.c
@@ -97,6 +97,7 @@ static const struct symbol runtime_exports[] = {
     {"__artiq_raise", &__artiq_raise},
     {"__artiq_reraise", &__artiq_reraise},
     {"strcmp", &strcmp},
+    {"strlen", &strlen},
     {"abort", &ksupport_abort},
 
     /* proxified syscalls */