diff --git a/imageio/image_enc.c b/imageio/image_enc.c
index 0a37785e..1baf809d 100644
--- a/imageio/image_enc.c
+++ b/imageio/image_enc.c
@@ -361,7 +361,8 @@ int WebPWriteTIFF(FILE* fout, const WebPDecBuffer* const buffer) {
   const uint8_t* rgba = buffer->u.RGBA.rgba;
   const int stride = buffer->u.RGBA.stride;
   const uint8_t bytes_per_px = has_alpha ? 4 : 3;
-  const int assoc_alpha = WebPIsPremultipliedMode(buffer->colorspace) ? 1 : 2;
+  const uint8_t assoc_alpha =
+      WebPIsPremultipliedMode(buffer->colorspace) ? 1 : 2;
   // For non-alpha case, we omit tag 0x152 (ExtraSamples).
   const uint8_t num_ifd_entries = has_alpha ? NUM_IFD_ENTRIES
                                             : NUM_IFD_ENTRIES - 1;
diff --git a/imageio/pnmdec.c b/imageio/pnmdec.c
index 6ec8a57a..796fda2b 100644
--- a/imageio/pnmdec.c
+++ b/imageio/pnmdec.c
@@ -36,7 +36,7 @@ typedef struct {
   int depth;
   int max_value;
   int type;           // 5, 6 or 7
-  PNMFlags seen_flags;
+  int seen_flags;
 } PNMInfo;
 
 // -----------------------------------------------------------------------------