diff --git a/src/p_setup.c b/src/p_setup.c
index 330b3e1fcdb9d6bcadaf0d7d972e0783709adff5..c198d0c089c6cb79d89eddab3c4fb04d023d26a1 100644
--- a/src/p_setup.c
+++ b/src/p_setup.c
@@ -1563,17 +1563,17 @@ static void ParseTextmapSectorParameter(UINT32 i, char *param, char *val)
 	else if (fastcmp(param, "floorplane_b"))
 	{
 		textmap_planefloor.defined |= PD_B;
-		textmap_planefloor.a = FLOAT_TO_FIXED(atof(val));
+		textmap_planefloor.b = FLOAT_TO_FIXED(atof(val));
 	}
 	else if (fastcmp(param, "floorplane_c"))
 	{
 		textmap_planefloor.defined |= PD_C;
-		textmap_planefloor.a = FLOAT_TO_FIXED(atof(val));
+		textmap_planefloor.c = FLOAT_TO_FIXED(atof(val));
 	}
 	else if (fastcmp(param, "floorplane_d"))
 	{
 		textmap_planefloor.defined |= PD_D;
-		textmap_planefloor.a = FLOAT_TO_FIXED(atof(val));
+		textmap_planefloor.d = FLOAT_TO_FIXED(atof(val));
 	}
 	else if (fastcmp(param, "ceilingplane_a"))
 	{
@@ -1583,17 +1583,17 @@ static void ParseTextmapSectorParameter(UINT32 i, char *param, char *val)
 	else if (fastcmp(param, "ceilingplane_b"))
 	{
 		textmap_planeceiling.defined |= PD_B;
-		textmap_planeceiling.a = FLOAT_TO_FIXED(atof(val));
+		textmap_planeceiling.b = FLOAT_TO_FIXED(atof(val));
 	}
 	else if (fastcmp(param, "ceilingplane_c"))
 	{
 		textmap_planeceiling.defined |= PD_C;
-		textmap_planeceiling.a = FLOAT_TO_FIXED(atof(val));
+		textmap_planeceiling.c = FLOAT_TO_FIXED(atof(val));
 	}
 	else if (fastcmp(param, "ceilingplane_d"))
 	{
 		textmap_planeceiling.defined |= PD_D;
-		textmap_planeceiling.a = FLOAT_TO_FIXED(atof(val));
+		textmap_planeceiling.d = FLOAT_TO_FIXED(atof(val));
 	}
 	else if (fastcmp(param, "lightcolor"))
 	{
@@ -3308,7 +3308,7 @@ static void P_ConvertBinaryMap(void)
 				lines[i].args[4] |= TMSC_BACKTOFRONTCEILING;
 			lines[i].special = 720;
 			break;
-		
+
 		case 900: //Translucent wall (10%)
 		case 901: //Translucent wall (20%)
 		case 902: //Translucent wall (30%)