diff --git a/libImaging/Access.c b/libImaging/Access.c
index 292968f1c..05eb10c7c 100644
--- a/libImaging/Access.c
+++ b/libImaging/Access.c
@@ -227,6 +227,7 @@ ImagingAccessInit()
     ADD("I;16", line_16, get_pixel_16L, put_pixel_16L);
     ADD("I;16L", line_16, get_pixel_16L, put_pixel_16L);
     ADD("I;16B", line_16, get_pixel_16B, put_pixel_16B);
+    ADD("I;16S", line_16, get_pixel_16L, put_pixel_16L);
     ADD("I;32L", line_32, get_pixel_32L, put_pixel_32L);
     ADD("I;32B", line_32, get_pixel_32B, put_pixel_32B);
     ADD("F", line_32, get_pixel_32, put_pixel_32);
diff --git a/libImaging/Pack.c b/libImaging/Pack.c
index e6253fca4..f74e18e1b 100644
--- a/libImaging/Pack.c
+++ b/libImaging/Pack.c
@@ -614,6 +614,7 @@ static struct {
     {"I;16",    "I;16",         16,     copy2},
     {"I;16B",   "I;16B",        16,     copy2},
     {"I;16L",   "I;16L",        16,     copy2},
+    {"I;16S",   "I;16S",        16,     copy2},
     {"I;16",    "I;16N",        16,     packI16N_I16}, // LibTiff native->image endian.
     {"I;16L",   "I;16N",        16,     packI16N_I16},
     {"I;16B",   "I;16N",        16,     packI16N_I16B},
diff --git a/libImaging/Storage.c b/libImaging/Storage.c
index 615c5fa20..d20af29a1 100644
--- a/libImaging/Storage.c
+++ b/libImaging/Storage.c
@@ -116,7 +116,8 @@ ImagingNewPrologueSubtype(const char *mode, int xsize, int ysize, int size)
         im->type = IMAGING_TYPE_INT32;
 
     } else if (strcmp(mode, "I;16") == 0 || strcmp(mode, "I;16L") == 0 \
-                           || strcmp(mode, "I;16B") == 0 || strcmp(mode, "I;16N") == 0)  {
+                           || strcmp(mode, "I;16B") == 0 || strcmp(mode, "I;16N") == 0 \
+                           || strcmp(mode, "I;16S") == 0)  {
         /* EXPERIMENTAL */
         /* 16-bit raw integer images */
         im->bands = 1;
diff --git a/libImaging/Unpack.c b/libImaging/Unpack.c
index c7b9a606c..183193983 100644
--- a/libImaging/Unpack.c
+++ b/libImaging/Unpack.c
@@ -1406,6 +1406,7 @@ static struct {
     {"I;16",    "I;16",         16,     copy2},
     {"I;16B",   "I;16B",        16,     copy2},
     {"I;16L",   "I;16L",        16,     copy2},
+    {"I;16S",   "I;16S",         16,     copy2},
 
     {"I;16", 	"I;16N",	    16,	    unpackI16N_I16}, // LibTiff native->image endian.
     {"I;16L", 	"I;16N",	    16,	    unpackI16N_I16}, // LibTiff native->image endian.