diff --git a/server/RouteController.cpp b/server/RouteController.cpp
index b2cd93a..e4b7cc1 100644
--- a/server/RouteController.cpp
+++ b/server/RouteController.cpp
@@ -180,6 +180,15 @@
 // |iov| is an array of struct iovec that contains the netlink message payload.
 // The netlink header is generated by this function based on |action| and |flags|.
 // Returns -errno if there was an error or if the kernel reported an error.
+
+// Disable optimizations in ASan build.
+// ASan reports an out-of-bounds 32-bit(!) access in the first loop of the
+// function (over iov[]).
+#ifdef __clang__
+#if __has_feature(address_sanitizer)
+__attribute__((optnone))
+#endif
+#endif
 WARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen) {
     nlmsghdr nlmsg = {
         .nlmsg_type = action,