diff --git a/src/android/i_system.c b/src/android/i_system.c
index 0eacc428..150cbd50 100644
--- a/src/android/i_system.c
+++ b/src/android/i_system.c
@@ -158,10 +158,13 @@ void I_SetupMumble(void)
 {
 }
 
-void I_UpdateMumble(const MumblePos_t *MPos)
+#ifndef NOMUMBLE
+void I_UpdateMumble(const mobj_t *mobj, const listener_t listener)
 {
-  (void)MPos;
+	(void)mobj;
+	(void)listener;
 }
+#endif
 
 void I_OutputMsg(const char *fmt, ...)
 {
diff --git a/src/djgppdos/i_system.c b/src/djgppdos/i_system.c
index 42165276..854d68f4 100644
--- a/src/djgppdos/i_system.c
+++ b/src/djgppdos/i_system.c
@@ -175,10 +175,13 @@ void I_SetupMumble(void)
 {
 }
 
-void I_UpdateMumble(const MumblePos_t *MPos)
+#ifndef NOMUMBLE
+void I_UpdateMumble(const mobj_t *mobj, const listener_t listener)
 {
-	(void)MPos;
+	(void)mobj;
+	(void)listener;
 }
+#endif
 
 //
 //  Allocates the base zone memory,
diff --git a/src/nds/i_system.c b/src/nds/i_system.c
index ab30c7eb..0ed58029 100644
--- a/src/nds/i_system.c
+++ b/src/nds/i_system.c
@@ -149,10 +149,13 @@ void I_SetupMumble(void)
 {
 }
 
-void I_UpdateMumble(const MumblePos_t *MPos)
+#ifndef NOMUMBLE
+void I_UpdateMumble(const mobj_t *mobj, const listener_t listener)
 {
-	(void)MPos;
+	(void)mobj;
+	(void)listener;
 }
+#endif
 
 void I_OutputMsg(const char *error, ...)
 {