diff --git a/picohttp/democlient.h b/picohttp/democlient.h
index 1c88100f8..75c24a5a4 100644
--- a/picohttp/democlient.h
+++ b/picohttp/democlient.h
@@ -61,9 +61,9 @@ typedef struct st_picoquic_demo_stream_ctx_t {
     uint64_t post_sent;
     char* f_name;
     FILE* F; /* NULL if stream is closed or no_disk. */
-    int is_open : 1;
-    int is_file_open : 1;
-    int flow_opened : 1;
+    unsigned int is_open : 1;
+    unsigned int is_file_open : 1;
+    unsigned int flow_opened : 1;
 } picoquic_demo_client_stream_ctx_t;
 
 typedef struct st_picoquic_demo_client_callback_ctx_t {
diff --git a/picoquic/frames.c b/picoquic/frames.c
index f976e8f3f..2c0947998 100644
--- a/picoquic/frames.c
+++ b/picoquic/frames.c
@@ -2041,7 +2041,6 @@ uint8_t* picoquic_copy_single_stream_frame_for_retransmit(picoquic_cnx_t* cnx, p
 uint8_t* picoquic_copy_stream_frames_for_retransmit(picoquic_cnx_t* cnx,
     uint8_t* bytes_next, uint8_t* bytes_max, uint64_t current_priority, int* more_data, int* is_pure_ack)
 {
-    uint8_t* bytes_first;
     int more_retransmit = 0;
     int packet_dequeued = 0;
     picoquic_packet_t* packet = NULL;
@@ -2055,7 +2054,6 @@ uint8_t* picoquic_copy_stream_frames_for_retransmit(picoquic_cnx_t* cnx,
             break;
         }
         else {
-            bytes_first = bytes_next;
             more_retransmit = 0;
             bytes_next = picoquic_copy_single_stream_frame_for_retransmit(cnx, packet, 
                 bytes_next, bytes_max, current_priority, &more_retransmit, &packet_dequeued, is_pure_ack);
diff --git a/picoquictest/mediatest.c b/picoquictest/mediatest.c
index 04724ce38..e80a26c98 100644
--- a/picoquictest/mediatest.c
+++ b/picoquictest/mediatest.c
@@ -1111,8 +1111,6 @@ int mediatest_loop(mediatest_ctx_t* mt_ctx, uint64_t simulated_time_max, int is_
 int mediatest_one(int media_test_id, mediatest_spec_t * spec)
 {
     int ret = 0;
-    int nb_steps = 0;
-    int nb_inactive = 0;
     int is_finished = 0;
 
     /* set the configuration */
diff --git a/picoquictest/minicrypto_test.c b/picoquictest/minicrypto_test.c
index 34955a3ac..6821ec02c 100644
--- a/picoquictest/minicrypto_test.c
+++ b/picoquictest/minicrypto_test.c
@@ -112,11 +112,11 @@ int minicrypto_is_last_test()
     int expected_aes128gcm_sha256 = 1;
     int expected_aes128gcm_sha256_low = 1;
     int expected_set_key = 1;
-    int actual_aes128gcm_sha256;
-    int actual_aes128gcm_sha256_low;
+    int using_aes128gcm_sha256;
+    int using_aes128gcm_sha256_low;
     int actual_set_key;
-    void* actual_aes128gcmsha256 = picoquic_get_aes128gcm_sha256_v(0);
-    void* actual_aes128gcmsha256_low = picoquic_get_aes128gcm_sha256_v(1);
+    void* actual_aes128gcm_sha256 = picoquic_get_aes128gcm_sha256_v(0);
+    void* actual_aes128gcm_sha256_low = picoquic_get_aes128gcm_sha256_v(1);
 
     picoquic_tls_api_reset(0);
 
@@ -129,25 +129,19 @@ int minicrypto_is_last_test()
 #if !defined(PTLS_WITHOUT_OPENSSL)
     expected_set_key = 0;
 #endif
-    actual_aes128gcm_sha256 = (actual_aes128gcmsha256 == (void*)&ptls_minicrypto_aes128gcmsha256);
-    actual_aes128gcm_sha256_low = (actual_aes128gcmsha256 == (void*)&ptls_minicrypto_aes128gcmsha256);
+    using_aes128gcm_sha256 = (actual_aes128gcm_sha256 == (void*)&ptls_minicrypto_aes128gcmsha256);
+    using_aes128gcm_sha256_low = (actual_aes128gcm_sha256_low == (void*)&ptls_minicrypto_aes128gcmsha256);
     actual_set_key = (picoquic_set_private_key_from_file_fn == picoquic_minicrypto_set_key_fn);
-    if (actual_aes128gcm_sha256 != expected_aes128gcm_sha256) {
+    if (using_aes128gcm_sha256 != expected_aes128gcm_sha256) {
         DBG_PRINTF("Wrong aes gcm 128 sha 256. Expected: %s, actual: %s",
             (expected_aes128gcm_sha256) ? "minicrypto" : "other",
-            (actual_aes128gcm_sha256) ? "minicrypto" : "other");
+            (using_aes128gcm_sha256) ? "minicrypto" : "other");
         ret = -1;
     }
-    if (actual_aes128gcm_sha256 != expected_aes128gcm_sha256) {
-        DBG_PRINTF("Wrong aes gcm 128 sha 256. Expected: %s, actual: %s",
-            (expected_aes128gcm_sha256) ? "minicrypto" : "other",
-            (actual_aes128gcm_sha256) ? "minicrypto" : "other");
-        ret = -1;
-    }
-    if (actual_aes128gcm_sha256 != expected_aes128gcm_sha256) {
-        DBG_PRINTF("Wrong aes gcm 128 sha 256. Expected: %s, actual: %s",
-            (expected_aes128gcm_sha256) ? "minicrypto" : "other",
-            (actual_aes128gcm_sha256) ? "minicrypto" : "other");
+    if (using_aes128gcm_sha256_low != expected_aes128gcm_sha256_low) {
+        DBG_PRINTF("Wrong aes gcm 128 sha 256 low. Expected: %s, actual: %s",
+            (expected_aes128gcm_sha256_low) ? "minicrypto" : "other",
+            (using_aes128gcm_sha256_low) ? "minicrypto" : "other");
         ret = -1;
     }
     if (actual_set_key != expected_set_key) {