diff --git a/fakeradio.c b/fakeradio.c
index 2ca3be4f..026e5f05 100644
--- a/fakeradio.c
+++ b/fakeradio.c
@@ -355,7 +355,7 @@ void transfer_bytes(struct radio_state *radios)
   
   if (bytes>0){
     log_time();
-    fprintf(stderr, "Transferring %d byte packet from %s to %s\n", bytes, t->name, r->name);
+    fprintf(stderr, "Transferring %zd byte packet from %s to %s\n", bytes, t->name, r->name);
   }
   
   unsigned i, j;
diff --git a/overlay_buffer.c b/overlay_buffer.c
index cfb278b7..41497bc5 100644
--- a/overlay_buffer.c
+++ b/overlay_buffer.c
@@ -246,7 +246,7 @@ void _ob_append_byte(struct __sourceloc __whence, struct overlay_buffer *b, unsi
   if (ob_makespace(b, bytes)) {
     b->bytes[b->position] = byte;
     if (config.debug.overlaybuffer)
-      DEBUGF("ob_append_byte(b=%p, byte=0x%02x) %p[%d]=%02x position=%zu", b, byte, b->bytes, b->position, byte, b->position + bytes);
+      DEBUGF("ob_append_byte(b=%p, byte=0x%02x) %p[%zd]=%02x position=%zu", b, byte, b->bytes, b->position, byte, b->position + bytes);
   } else {
     if (config.debug.overlaybuffer)
       DEBUGF("ob_append_byte(b=%p, byte=0x%02x) OVERRUN position=%zu", b, byte, b->position + bytes);
@@ -293,7 +293,7 @@ void _ob_append_ui16(struct __sourceloc __whence, struct overlay_buffer *b, uint
     b->bytes[b->position] = (v >> 8) & 0xFF;
     b->bytes[b->position+1] = v & 0xFF;
     if (config.debug.overlaybuffer)
-      DEBUGF("ob_append_ui16(b=%p, v=%u) %p[%d]=%s position=%zu", b, v, b->bytes, b->position, alloca_tohex(&b->bytes[b->position], bytes), b->position + bytes);
+      DEBUGF("ob_append_ui16(b=%p, v=%u) %p[%zd]=%s position=%zu", b, v, b->bytes, b->position, alloca_tohex(&b->bytes[b->position], bytes), b->position + bytes);
   } else {
     if (config.debug.overlaybuffer)
       DEBUGF("ob_append_ui16(b=%p, v=%u) OVERRUN position=%zu", b, v, b->position + bytes);
@@ -310,7 +310,7 @@ void _ob_append_ui32(struct __sourceloc __whence, struct overlay_buffer *b, uint
     b->bytes[b->position+2] = (v >> 8) & 0xFF;
     b->bytes[b->position+3] = v & 0xFF;
     if (config.debug.overlaybuffer)
-      DEBUGF("ob_append_ui32(b=%p, v=%"PRIu32") %p[%d]=%s position=%zu",
+      DEBUGF("ob_append_ui32(b=%p, v=%"PRIu32") %p[%zd]=%s position=%zu",
 	  b, v, b->bytes, b->position, alloca_tohex(&b->bytes[b->position], bytes), b->position + bytes);
   } else {
     if (config.debug.overlaybuffer)
@@ -332,7 +332,7 @@ void _ob_append_ui64(struct __sourceloc __whence, struct overlay_buffer *b, uint
     b->bytes[b->position+6] = (v >> 8) & 0xFF;
     b->bytes[b->position+7] = v & 0xFF;
     if (config.debug.overlaybuffer)
-      DEBUGF("ob_append_ui64(b=%p, v=%"PRIu64") %p[%d]=%s position=%zu",
+      DEBUGF("ob_append_ui64(b=%p, v=%"PRIu64") %p[%zd]=%s position=%zu",
 	  b, v, b->bytes, b->position, alloca_tohex(&b->bytes[b->position], bytes), b->position + bytes);
   } else {
     if (config.debug.overlaybuffer)
@@ -530,7 +530,7 @@ void _ob_set_ui16(struct __sourceloc __whence, struct overlay_buffer *b, size_t
   b->bytes[offset] = (v >> 8) & 0xFF;
   b->bytes[offset+1] = v & 0xFF;
   if (config.debug.overlaybuffer)
-    DEBUGF("ob_set_ui16(b=%p, offset=%d, v=%u) %p[%d]=%s", b, offset, v, b->bytes, offset, alloca_tohex(&b->bytes[offset], bytes));
+    DEBUGF("ob_set_ui16(b=%p, offset=%zd, v=%u) %p[%zd]=%s", b, offset, v, b->bytes, offset, alloca_tohex(&b->bytes[offset], bytes));
 }
 
 void _ob_set(struct __sourceloc __whence, struct overlay_buffer *b, size_t offset, unsigned char byte)
@@ -541,7 +541,7 @@ void _ob_set(struct __sourceloc __whence, struct overlay_buffer *b, size_t offse
   assert(offset + bytes <= b->allocSize);
   b->bytes[offset] = byte;
   if (config.debug.overlaybuffer)
-    DEBUGF("ob_set(b=%p, offset=%d, byte=0x%02x) %p[%d]=%s", b, offset, byte, b->bytes, offset, alloca_tohex(&b->bytes[offset], bytes));
+    DEBUGF("ob_set(b=%p, offset=%zd, byte=0x%02x) %p[%zd]=%s", b, offset, byte, b->bytes, offset, alloca_tohex(&b->bytes[offset], bytes));
 }
 
 void _ob_patch_rfs(struct __sourceloc __whence, struct overlay_buffer *b)
diff --git a/overlay_mdp.c b/overlay_mdp.c
index eae40e67..b9cd1f8d 100644
--- a/overlay_mdp.c
+++ b/overlay_mdp.c
@@ -773,7 +773,7 @@ static int overlay_send_frame(
     return -1;
   }
   if (config.debug.mdprequests) {
-    DEBUGF("Send frame %u bytes", ob_position(plaintext));
+    DEBUGF("Send frame %zu bytes", ob_position(plaintext));
     dump("Frame plaintext", ob_ptr(plaintext), ob_position(plaintext));
   }
   
diff --git a/overlay_packetformats.c b/overlay_packetformats.c
index 235004fa..1ff83556 100644
--- a/overlay_packetformats.c
+++ b/overlay_packetformats.c
@@ -439,7 +439,7 @@ int packetOkOverlay(struct overlay_interface *interface,unsigned char *packet, s
 
 	  if (config.debug.overlayframes)
 	    dump("Payload Header", header_start, current - header_start);
-	  ret = WHYF("Invalid payload length (%d)", payload_len);
+	  ret = WHYF("Invalid payload length (%zd)", payload_len);
 	  goto end;
 	}
 	break;
@@ -448,7 +448,7 @@ int packetOkOverlay(struct overlay_interface *interface,unsigned char *packet, s
     int next_payload = ob_position(b) + payload_len;
     
     if (config.debug.overlayframes){
-      DEBUGF("Received payload type %x, len %d", f.type, payload_len);
+      DEBUGF("Received payload type %x, len %zd", f.type, payload_len);
       DEBUGF("Payload from %s", f.source?alloca_tohex_sid_t(f.source->sid):"NULL");
       DEBUGF("Payload to %s", (f.destination?alloca_tohex_sid_t(f.destination->sid):"broadcast"));
       if (!is_all_matching(f.broadcast_id.id, BROADCAST_LEN, 0))
diff --git a/overlay_queue.c b/overlay_queue.c
index 88f73817..5c48965b 100644
--- a/overlay_queue.c
+++ b/overlay_queue.c
@@ -471,7 +471,7 @@ overlay_stuff_packet(struct outgoing_packet *packet, overlay_txqueue *queue, tim
     frame->transmit_count++;
     
     if (config.debug.overlayframes){
-      DEBUGF("Appended payload %p, %d type %x len %d for %s via %s", 
+      DEBUGF("Appended payload %p, %d type %x len %zd for %s via %s", 
 	     frame, frame->mdp_sequence,
 	     frame->type, ob_position(frame->payload),
 	     frame->destination?alloca_tohex_sid_t(frame->destination->sid):"All",
diff --git a/radio_link.c b/radio_link.c
index 43174532..c3a2e53b 100644
--- a/radio_link.c
+++ b/radio_link.c
@@ -431,7 +431,7 @@ static int radio_link_parse(struct overlay_interface *interface, struct radio_li
     
   if (payload[4]&0x80) {
     if (config.debug.radio_link) 
-      DEBUGF("PDU Complete (length=%d)",state->packet_length);
+      DEBUGF("PDU Complete (length=%zd)",state->packet_length);
     
     packetOkOverlay(interface, state->dst, state->packet_length, NULL);
     state->packet_length=sizeof(state->dst)+1;
diff --git a/rhizome_direct_http.c b/rhizome_direct_http.c
index 53dd7e06..7faa9140 100644
--- a/rhizome_direct_http.c
+++ b/rhizome_direct_http.c
@@ -423,7 +423,7 @@ static int receive_http_response(int sock, char *buffer, size_t buffer_len, stru
   ssize_t count;
   do {
       if ((count = read(sock, &buffer[len], buffer_len - len)) == -1)
-	return WHYF_perror("read(%d, %p, %d)", sock, &buffer[len], (int)buffer_len - len);
+	return WHYF_perror("read(%d, %p, %d)", sock, &buffer[len], (int)(buffer_len - len));
       len += (size_t)count;
   } while (len < buffer_len && count != 0 && !is_http_header_complete(buffer, len, len));
   if (config.debug.rhizome_rx)
diff --git a/rhizome_packetformats.c b/rhizome_packetformats.c
index 8ea6027b..21b89048 100644
--- a/rhizome_packetformats.c
+++ b/rhizome_packetformats.c
@@ -315,7 +315,7 @@ int overlay_rhizome_saw_advertisements(struct decode_context *context, struct ov
       
       unsigned char *data = ob_get_bytes_ptr(f->payload, manifest_length);
       if (!data) {
-	WHYF("Illegal manifest length field in rhizome advertisement frame %zu vs %d", 
+	WHYF("Illegal manifest length field in rhizome advertisement frame %zu vs %zd", 
 	     manifest_length, ob_remaining(f->payload));
 	break;
       }
@@ -408,7 +408,7 @@ next:
     unsigned char *bar;
     bars[bar_count]=bar=ob_get_bytes_ptr(f->payload, RHIZOME_BAR_BYTES);
     if (!bar){
-      WARNF("Expected whole BAR @%x (only %d bytes remain)", ob_position(f->payload), ob_remaining(f->payload));
+      WARNF("Expected whole BAR @%zx (only %zd bytes remain)", ob_position(f->payload), ob_remaining(f->payload));
       break;
     }