diff --git a/libImaging/Gif.h b/libImaging/Gif.h
index 85d428b0d..2cb95efd2 100644
--- a/libImaging/Gif.h
+++ b/libImaging/Gif.h
@@ -59,7 +59,7 @@ typedef struct {
     unsigned char buffer[GIFTABLE];
 
     /* Symbol table */
-    unsigned INT16 link[GIFTABLE];
+    UINT16 link[GIFTABLE];
     unsigned char data[GIFTABLE];
     int next;
 
diff --git a/libImaging/Lzw.h b/libImaging/Lzw.h
index 7d087ac47..8fc30bd7f 100644
--- a/libImaging/Lzw.h
+++ b/libImaging/Lzw.h
@@ -45,7 +45,7 @@ typedef struct {
     unsigned char buffer[LZWTABLE];
 
     /* Symbol table */
-    unsigned INT16 link[LZWTABLE];
+    UINT16 link[LZWTABLE];
     unsigned char data[LZWTABLE];
     int next;