diff --git a/src/d_netcmd.c b/src/d_netcmd.c
index 65d1f2d3d..18239fccf 100644
--- a/src/d_netcmd.c
+++ b/src/d_netcmd.c
@@ -4876,7 +4876,7 @@ static void Command_cxdiag_f(void)
 					continue;
 				}
 
-				if (cn->type == UC_AND || cn->type == UC_COMMA)
+				if (cn->type == UC_AND || cn->type == UC_THEN || cn->type == UC_COMMA)
 				{
 					if (firstpass)
 						;
diff --git a/src/deh_soc.c b/src/deh_soc.c
index 3948d3a27..e508c8d49 100644
--- a/src/deh_soc.c
+++ b/src/deh_soc.c
@@ -2983,6 +2983,7 @@ static void readcondition(UINT16 set, UINT32 id, char *word2)
 		}
 	}
 	else if ((offset=0) || fastcmp(params[0], "AND")
+	||        (++offset && fastcmp(params[0], "THEN"))
 	||        (++offset && fastcmp(params[0], "COMMA")))
 	{
 		//PARAMCHECK(1);
diff --git a/src/m_cond.c b/src/m_cond.c
index 226443e38..f4d5422a6 100644
--- a/src/m_cond.c
+++ b/src/m_cond.c
@@ -1638,6 +1638,7 @@ boolean M_CheckCondition(condition_t *cn, player_t *player)
 
 		// Just for string building
 		case UC_AND:
+		case UC_THEN:
 		case UC_COMMA:
 		case UC_DESCRIPTIONOVERRIDE:
 			return true;
@@ -2008,7 +2009,7 @@ static boolean M_CheckConditionSet(conditionset_t *c, player_t *player)
 			continue;
 
 		// Skip entries that are JUST for string building
-		if (cn->type == UC_AND || cn->type == UC_COMMA || cn->type == UC_DESCRIPTIONOVERRIDE)
+		if (cn->type == UC_AND || cn->type == UC_THEN || cn->type == UC_COMMA || cn->type == UC_DESCRIPTIONOVERRIDE)
 			continue;
 
 		lastID = cn->id;
@@ -2524,6 +2525,8 @@ static const char *M_GetConditionString(condition_t *cn)
 
 		case UC_AND:
 			return "&";
+		case UC_THEN:
+			return "then";
 		case UC_COMMA:
 			return ",";
 		case UC_DESCRIPTIONOVERRIDE:
diff --git a/src/m_cond.h b/src/m_cond.h
index 90c219c39..b23d267f1 100644
--- a/src/m_cond.h
+++ b/src/m_cond.h
@@ -76,6 +76,7 @@ typedef enum
 
 	 // Just for string building
 	UC_AND,
+	UC_THEN,
 	UC_COMMA,
 	UC_DESCRIPTIONOVERRIDE,