diff --git a/polymer/eduke32/source/actors.h b/polymer/eduke32/source/actors.h
index ca5ed671d..0363907f1 100644
--- a/polymer/eduke32/source/actors.h
+++ b/polymer/eduke32/source/actors.h
@@ -25,7 +25,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
 // Uncomment to have the same sizeof(actor_t) and sizeof(netactor_t) across
 // 32- and 64-bit builds;  KEEPINSYNC with same #define in gamedef.h:
-//#define SAMESIZE_ACTOR_T
+#define SAMESIZE_ACTOR_T
 
 #define MAXSLEEPDIST        16384
 #define SLEEPTIME           1536
diff --git a/polymer/eduke32/source/duke3d.h b/polymer/eduke32/source/duke3d.h
index 5250d013a..ffb91f55d 100644
--- a/polymer/eduke32/source/duke3d.h
+++ b/polymer/eduke32/source/duke3d.h
@@ -65,7 +65,7 @@ extern "C" {
 
 // Uncomment to have the same sizeof(actor_t) and sizeof(netactor_t) across
 // 32- and 64-bit builds;  KEEPINSYNC with same #define in actors.h and gamedef.h:
-//#define SAMESIZE_ACTOR_T
+#define SAMESIZE_ACTOR_T
 
 // increase by 3, because atomic GRP adds 1, and Shareware adds 2
 #ifdef YAX_ENABLE
diff --git a/polymer/eduke32/source/gamedef.h b/polymer/eduke32/source/gamedef.h
index 055fcb15c..0246bcff1 100644
--- a/polymer/eduke32/source/gamedef.h
+++ b/polymer/eduke32/source/gamedef.h
@@ -25,7 +25,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
 // Uncomment to have the same sizeof(actor_t) and sizeof(netactor_t) across
 // 32- and 64-bit builds;  KEEPINSYNC with same #define in actors.h:
-//#define SAMESIZE_ACTOR_T
+#define SAMESIZE_ACTOR_T
 
 #define MAXGAMEEVENTS   128
 #define LABEL_HASPARM2  1