diff --git a/doomsday/plugins/jdoom/defs/flags.ded b/doomsday/plugins/jdoom/defs/flags.ded
index 3b818e26d6..69d5fe711d 100644
--- a/doomsday/plugins/jdoom/defs/flags.ded
+++ b/doomsday/plugins/jdoom/defs/flags.ded
@@ -56,3 +56,4 @@ Flag { ID = "mf2_dontdraw"; Value = 0x100000; }
 
 # Mobj flags3:
 Flag { ID = "mf3_noinfight"; Value = 0x1; }
+Flag { ID = "mf3_clientaction"; Value = 0x2; }
diff --git a/doomsday/plugins/jdoom/include/p_mobj.h b/doomsday/plugins/jdoom/include/p_mobj.h
index f324b933f6..392166e081 100644
--- a/doomsday/plugins/jdoom/include/p_mobj.h
+++ b/doomsday/plugins/jdoom/include/p_mobj.h
@@ -137,6 +137,7 @@
 // --- mobj.flags3 ---
 
 #define MF3_NOINFIGHT       0x00000001  // Mobj will never be targeted for in-fighting
+#define MF3_CLIENTACTION    0x00000002  // States' action funcs are executed by client
 
 // --- mobj.intflags ---
 // Internal mobj flags cannot be set using an external definition.
diff --git a/doomsday/plugins/jdoom64/defs/flags.ded b/doomsday/plugins/jdoom64/defs/flags.ded
index a7c82be2cf..cb27ea284d 100644
--- a/doomsday/plugins/jdoom64/defs/flags.ded
+++ b/doomsday/plugins/jdoom64/defs/flags.ded
@@ -56,3 +56,4 @@ Flag { ID = "mf2_dontdraw"; Value = 0x100000; }
 
 # Mobj flags3:
 Flag { ID = "mf3_noinfight"; Value = 0x1; }
+Flag { ID = "mf3_clientaction"; Value = 0x2; }
diff --git a/doomsday/plugins/jdoom64/include/p_mobj.h b/doomsday/plugins/jdoom64/include/p_mobj.h
index 44ef445492..b110c2036e 100644
--- a/doomsday/plugins/jdoom64/include/p_mobj.h
+++ b/doomsday/plugins/jdoom64/include/p_mobj.h
@@ -222,6 +222,7 @@
 // --- mobj.flags3 ---
 
 #define MF3_NOINFIGHT       0x00000001  // Mobj will never be targeted for in-fighting
+#define MF3_CLIENTACTION    0x00000002  // States' action funcs are executed by client
 
 // --- mobj.intflags ---
 // Internal mobj flags cannot be set using an external definition.
diff --git a/doomsday/plugins/jheretic/defs/flags.ded b/doomsday/plugins/jheretic/defs/flags.ded
index ccd7804bd0..565456fbcd 100644
--- a/doomsday/plugins/jheretic/defs/flags.ded
+++ b/doomsday/plugins/jheretic/defs/flags.ded
@@ -58,3 +58,4 @@ Flag { ID = "mf2_dontdraw"; Value = 0x100000; }
 
 # Mobj flags3:
 Flag { ID = "mf3_noinfight"; Value = 0x1; }
+Flag { ID = "mf3_clientaction"; Value = 0x2; }
diff --git a/doomsday/plugins/jheretic/include/p_mobj.h b/doomsday/plugins/jheretic/include/p_mobj.h
index 495ce42366..b5191747b5 100644
--- a/doomsday/plugins/jheretic/include/p_mobj.h
+++ b/doomsday/plugins/jheretic/include/p_mobj.h
@@ -135,6 +135,7 @@
 // --- mobj.flags3 ---
 
 #define MF3_NOINFIGHT       0x00000001  // Mobj will never be targeted for in-fighting
+#define MF3_CLIENTACTION    0x00000002  // States' action funcs are executed by client
 
 // --- mobj.intflags --- (added in MOBJ_SAVEVERSION 6)
 // Internal mobj flags cannot be set using an external definition.
diff --git a/doomsday/plugins/jhexen/defs/flags.ded b/doomsday/plugins/jhexen/defs/flags.ded
index a2e91ba91e..ecafb99af9 100644
--- a/doomsday/plugins/jhexen/defs/flags.ded
+++ b/doomsday/plugins/jhexen/defs/flags.ded
@@ -69,6 +69,7 @@ Flag { ID = "mf2_reflective"; Value = 0x80000000; }
 
 # Mobj flags3:
 Flag { ID = "mf3_noinfight"; Value = 0x1; }
+Flag { ID = "mf3_clientaction"; Value = 0x2; }
 
 #
 # Obsolete (unused) flags:
diff --git a/doomsday/plugins/jhexen/include/p_mobj.h b/doomsday/plugins/jhexen/include/p_mobj.h
index 10b01ab192..b8d649a5f6 100644
--- a/doomsday/plugins/jhexen/include/p_mobj.h
+++ b/doomsday/plugins/jhexen/include/p_mobj.h
@@ -145,6 +145,7 @@
 // --- mobj.flags3 ---
 
 #define MF3_NOINFIGHT       0x00000001  // Mobj will never be targeted for in-fighting
+#define MF3_CLIENTACTION    0x00000002  // States' action funcs are executed by client
 
 typedef enum dirtype_s {
     DI_EAST,