diff --git a/src/pulsecore/protocol-dbus.c b/src/pulsecore/protocol-dbus.c
index 6a0dcf344..03cebc1ea 100644
--- a/src/pulsecore/protocol-dbus.c
+++ b/src/pulsecore/protocol-dbus.c
@@ -468,10 +468,15 @@ static enum find_result_t find_handler(struct call_info *call_info) {
         else if (!(call_info->iface_entry = pa_hashmap_get(call_info->obj_entry->interfaces, call_info->interface)))
             return NO_SUCH_INTERFACE;
 
-        else if ((call_info->method_handler = pa_hashmap_get(call_info->iface_entry->method_handlers, call_info->method)))
+        else if ((call_info->method_handler = pa_hashmap_get(call_info->iface_entry->method_handlers, call_info->method))) {
+            call_info->expected_method_sig = pa_hashmap_get(call_info->iface_entry->method_signatures, call_info->method);
+
+            if (!pa_streq(call_info->method_sig, call_info->expected_method_sig))
+                return INVALID_METHOD_SIG;
+
             return FOUND_METHOD;
 
-        else
+        } else
             return NO_SUCH_METHOD;
 
     } else { /* The method call doesn't contain an interface. */