diff --git a/lumps/textures/textures.cfg b/lumps/textures/textures.cfg
index f283bc98..4ff637ea 100644
--- a/lumps/textures/textures.cfg
+++ b/lumps/textures/textures.cfg
@@ -2929,3 +2929,29 @@ PORAN                   64      128
 *       PORAN           0       0
 PWHITE                  64      128
 *       PWHITE          0       0
+
+; These are actually colormaps included in the Freedoom IWADs.
+; They don't need texture entries, but the colormap names are used
+; on property transfer lines, to apply a colormap to a sector or
+; region. This can cause source ports that aren't Boom compatible
+; to bomb out with invalid texture errors.
+; While technically Freedoom is only for Boom-compatible source
+; ports, it's nice to be at least able to load the level, and
+; having dummy texture entries for the colormaps doesn't seem to
+; do any harm (I checked several source ports to check colormaps
+; were still applied correctly).
+WATERMAP		128	128
+*	WALL24_1	0	0
+BLOODMAP		128	128
+*	WALL24_1	0	0
+BLUEMAP			128	128
+*	WALL24_1	0	0
+LAVAMAP			128	128
+*	WALL24_1	0	0
+NUKEMAP			128	128
+*	WALL24_1	0	0
+FOGMAP			128	128
+*	WALL24_1	0	0
+MFADEMAP		128	128
+*	WALL24_1	0	0
+