diff --git a/src/rt/rust_builtin.cpp b/src/rt/rust_builtin.cpp
index a3101e7edc9..0b4ce047997 100644
--- a/src/rt/rust_builtin.cpp
+++ b/src/rt/rust_builtin.cpp
@@ -654,6 +654,13 @@ rust_dbg_lock_signal(lock_and_signal *lock) {
     lock->signal();
 }
 
+typedef void *(*dbg_callback)(void*);
+
+extern "C" CDECL void *
+rust_dbg_call(dbg_callback *cb, void *data) {
+    return (*cb)(data);
+}
+
 //
 // Local Variables:
 // mode: C++
diff --git a/src/rt/rustrt.def.in b/src/rt/rustrt.def.in
index f1e543ed6d4..bcdb2079d97 100644
--- a/src/rt/rustrt.def.in
+++ b/src/rt/rustrt.def.in
@@ -104,3 +104,4 @@ rust_dbg_lock_lock
 rust_dbg_lock_unlock
 rust_dbg_lock_wait
 rust_dbg_lock_signal
+rust_dbg_call
\ No newline at end of file