diff --git a/src/encoding/bzip2.c b/src/encoding/bzip2.c
index 8591d634..6a203b53 100644
--- a/src/encoding/bzip2.c
+++ b/src/encoding/bzip2.c
@@ -36,8 +36,8 @@ struct bz2_enc_data {
 	 * end-of-stream marker and all data has been decompressed.
 	 * Then we neither read from the file nor call BZ2_bzDecompress
 	 * any more.  */
-	int last_read:1;
-	int after_end:1;
+	unsigned int last_read:1;
+	unsigned int after_end:1;
 
 	/* A buffer for data that has been read from the file but not
 	 * yet decompressed.  fbz_stream.next_in and fbz_stream.avail_in
diff --git a/src/encoding/lzma.c b/src/encoding/lzma.c
index ee37cb82..b2048be8 100644
--- a/src/encoding/lzma.c
+++ b/src/encoding/lzma.c
@@ -27,8 +27,8 @@
 struct lzma_enc_data {
 	lzma_stream flzma_stream;
 	int fdread;
-	int last_read:1;
-	int after_end:1;
+	unsigned int last_read:1;
+	unsigned int after_end:1;
 	unsigned char buf[ELINKS_BZ_BUFFER_LENGTH];
 };
 
diff --git a/src/encoding/zstd.c b/src/encoding/zstd.c
index 98bbcd8f..f8d63880 100644
--- a/src/encoding/zstd.c
+++ b/src/encoding/zstd.c
@@ -35,7 +35,7 @@ struct zstd_enc_data {
 	size_t sent_pos;
 	/* The file descriptor from which we read.  */
 	int fdread;
-	int decoded:1;
+	unsigned int decoded:1;
 };
 
 static int