diff --git a/libImaging/Storage.c b/libImaging/Storage.c
index fb27572d3..2ca1162eb 100644
--- a/libImaging/Storage.c
+++ b/libImaging/Storage.c
@@ -116,7 +116,7 @@ ImagingNewPrologueSubtype(const char *mode, int xsize, int ysize,
         im->linesize = xsize * 4;
         im->type = IMAGING_TYPE_INT32;
 
-    } else if (strcmp(mode, "I;16") == 0 || strcmp(mode, "I;16L") == 0 \
+    } else if (strcmp(mode, "I;16") == 0 || strcmp(mode, "I;16L") == 0 || strcmp(mode, "I;16S") == 0 \
                            || strcmp(mode, "I;16B") == 0 || strcmp(mode, "I;16N") == 0)  {
         /* EXPERIMENTAL */
         /* 16-bit raw integer images */