diff --git a/src/sdeventplus/internal/sdevent.hpp b/src/sdeventplus/internal/sdevent.hpp
index 8f2e608..f90e06b 100644
--- a/src/sdeventplus/internal/sdevent.hpp
+++ b/src/sdeventplus/internal/sdevent.hpp
@@ -102,8 +102,8 @@
                                                   uint64_t* usec) const = 0;
     virtual int sd_event_source_set_time_accuracy(sd_event_source* source,
                                                   uint64_t usec) const = 0;
-    virtual int sd_event_source_get_signal(sd_event_source*) const = 0;
-    virtual int sd_event_source_get_child_pid(sd_event_source*,
+    virtual int sd_event_source_get_signal(sd_event_source* source) const = 0;
+    virtual int sd_event_source_get_child_pid(sd_event_source* source,
                                               pid_t* pid) const = 0;
 };
 
@@ -206,8 +206,8 @@
                                           uint64_t* usec) const override;
     int sd_event_source_set_time_accuracy(sd_event_source* source,
                                           uint64_t usec) const override;
-    int sd_event_source_get_signal(sd_event_source*) const override;
-    int sd_event_source_get_child_pid(sd_event_source*,
+    int sd_event_source_get_signal(sd_event_source* source) const override;
+    int sd_event_source_get_child_pid(sd_event_source* source,
                                       pid_t* pid) const override;
 };