diff --git a/libavcodec/hnm4video.c b/libavcodec/hnm4video.c
index 4220202e15..700504d87c 100644
--- a/libavcodec/hnm4video.c
+++ b/libavcodec/hnm4video.c
@@ -37,8 +37,8 @@
 
 typedef struct Hnm4VideoContext {
     uint8_t version;
-    uint16_t width;
-    uint16_t height;
+    int width;
+    int height;
     uint8_t *current;
     uint8_t *previous;
     uint8_t *buffer1;