diff --git a/src/PIL/TiffImagePlugin.py b/src/PIL/TiffImagePlugin.py
index 9ffb885ceea..cb299792e0d 100644
--- a/src/PIL/TiffImagePlugin.py
+++ b/src/PIL/TiffImagePlugin.py
@@ -208,6 +208,10 @@
     (MM, 1, (2,), 1, (32,), ()): ("I", "I;32BS"),
     (II, 1, (3,), 1, (32,), ()): ("F", "F;32F"),
     (MM, 1, (3,), 1, (32,), ()): ("F", "F;32BF"),
+    (II, 1, (1,), 1, (8, 8), (0,)): ("L", "LX"),
+    (MM, 1, (1,), 1, (8, 8), (0,)): ("L", "LX"),
+    (II, 1, (1,), 1, (8, 8), (1,)): ("La", "La"),
+    (MM, 1, (1,), 1, (8, 8), (1,)): ("La", "La"),
     (II, 1, (1,), 1, (8, 8), (2,)): ("LA", "LA"),
     (MM, 1, (1,), 1, (8, 8), (2,)): ("LA", "LA"),
     (II, 2, (1,), 1, (8, 8, 8), ()): ("RGB", "RGB"),
diff --git a/src/libImaging/Mode.c b/src/libImaging/Mode.c
index f3ef7a2c18e..0ef444c9eb4 100644
--- a/src/libImaging/Mode.c
+++ b/src/libImaging/Mode.c
@@ -144,6 +144,7 @@ const RawModeData RAWMODES[] = {
     [IMAGING_RAWMODE_K_I] = {"K;I"},
     [IMAGING_RAWMODE_LA_16B] = {"LA;16B"},
     [IMAGING_RAWMODE_LA_L] = {"LA;L"},
+    [IMAGING_RAWMODE_LX] = {"LX"},
     [IMAGING_RAWMODE_L_16] = {"L;16"},
     [IMAGING_RAWMODE_L_16B] = {"L;16B"},
     [IMAGING_RAWMODE_L_2] = {"L;2"},
diff --git a/src/libImaging/Mode.h b/src/libImaging/Mode.h
index 39c0eb91994..0b33fb6ce36 100644
--- a/src/libImaging/Mode.h
+++ b/src/libImaging/Mode.h
@@ -144,6 +144,7 @@ typedef enum {
     IMAGING_RAWMODE_K_I,
     IMAGING_RAWMODE_LA_16B,
     IMAGING_RAWMODE_LA_L,
+    IMAGING_RAWMODE_LX,
     IMAGING_RAWMODE_L_16,
     IMAGING_RAWMODE_L_16B,
     IMAGING_RAWMODE_L_2,
diff --git a/src/libImaging/Unpack.c b/src/libImaging/Unpack.c
index a515682093d..7623275bd47 100644
--- a/src/libImaging/Unpack.c
+++ b/src/libImaging/Unpack.c
@@ -1582,6 +1582,7 @@ static struct {
     {IMAGING_MODE_L, IMAGING_RAWMODE_L_R, 8, unpackLR},
     {IMAGING_MODE_L, IMAGING_RAWMODE_L_16, 16, unpackL16},
     {IMAGING_MODE_L, IMAGING_RAWMODE_L_16B, 16, unpackL16B},
+    {IMAGING_MODE_L, IMAGING_RAWMODE_LX, 16, unpackL16B},
 
     /* grayscale w. alpha */
     {IMAGING_MODE_LA, IMAGING_RAWMODE_LA, 16, unpackLA},