diff --git a/fet.c b/fet.c
index 5a8bac8..60a5929 100644
--- a/fet.c
+++ b/fet.c
@@ -283,7 +283,7 @@ static int parse_packet(int plen)
 	int error;
 
 	if (c != r) {
-		fprintf(stderr, "parse_packet: checksum error (calc %04x,"
+		fprintf(stderr, "fet: checksum error (calc %04x,"
 			" recv %04x)\n", c, r);
 		return -1;
 	}
@@ -297,7 +297,7 @@ static int parse_packet(int plen)
 	error = fet_buf[i++];
 
 	if (error) {
-		fprintf(stderr, "parse_packet: FET returned error code %d\n",
+		fprintf(stderr, "fet: FET returned error code %d\n",
 			error);
 		if (error > 0 && error < ARRAY_LEN(error_strings)) {
 			fprintf(stderr, "    (%s)\n", error_strings[error]);
@@ -316,7 +316,7 @@ static int parse_packet(int plen)
 		i += 2;
 
 		if (fet_reply.argc >= MAX_PARAMS) {
-			fprintf(stderr, "parse_packet: too many params: %d\n",
+			fprintf(stderr, "fet: too many params: %d\n",
 				fet_reply.argc);
 			return -1;
 		}
@@ -351,7 +351,7 @@ static int parse_packet(int plen)
 	return 0;
 
 too_short:
-	fprintf(stderr, "parse_packet: too short (%d bytes)\n",
+	fprintf(stderr, "fet: too short (%d bytes)\n",
 		plen);
 	return -1;
 }
@@ -492,7 +492,7 @@ static int xfer(int command_code, const u_int8_t *data, int datalen,
 		return -1;
 
 	if (fet_reply.command_code != command_code) {
-		fprintf(stderr, "xfer: reply type mismatch\n");
+		fprintf(stderr, "fet: reply type mismatch\n");
 		return -1;
 	}
 
@@ -713,13 +713,13 @@ int fet_readmem(u_int16_t addr, u_int8_t *buffer, int count)
 		int plen = count > 128 ? 128 : count;
 
 		if (xfer(C_READMEMORY, NULL, 0, 2, addr, plen) < 0) {
-			fprintf(stderr, "fet_read_mem: failed to read "
+			fprintf(stderr, "fet: failed to read "
 				"from 0x%04x\n", addr);
 			return -1;
 		}
 
 		if (fet_reply.datalen < plen) {
-			fprintf(stderr, "fet_read_mem: short data: "
+			fprintf(stderr, "fet: short data: "
 				"%d bytes\n", fet_reply.datalen);
 			return -1;
 		}
diff --git a/main.c b/main.c
index 2225db3..78e451e 100644
--- a/main.c
+++ b/main.c
@@ -570,7 +570,7 @@ static int cmd_eval(char **arg)
 	const char *name;
 
 	if (stab_parse(*arg, &addr) < 0) {
-		fprintf(stderr, "eval: can't parse: %s\n", *arg);
+		fprintf(stderr, "=: can't parse: %s\n", *arg);
 		return -1;
 	}
 
@@ -601,7 +601,7 @@ static int cmd_syms(char **arg)
 	if (elf32_check(in))
 		result = elf32_syms(in);
 	else
-		fprintf(stderr, "%s: unknown file type\n", *arg);
+		fprintf(stderr, "syms: %s: unknown file type\n", *arg);
 
 	fclose(in);
 	return result;
diff --git a/rf2500.c b/rf2500.c
index 088c0f7..5a5cdc7 100644
--- a/rf2500.c
+++ b/rf2500.c
@@ -52,16 +52,16 @@ static int usbtr_open_interface(struct usb_device *dev, int ino)
 
 	usbtr_handle = usb_open(dev);
 	if (!usbtr_handle) {
-		perror("usbtr_open_interface: can't open device");
+		perror("rf2500: can't open device");
 		return -1;
 	}
 
 	if (usb_detach_kernel_driver_np(usbtr_handle, usbtr_int_number) < 0)
-		perror("usbtr_open_interface: warning: can't "
+		perror("rf2500: warning: can't "
 			"detach kernel driver");
 
 	if (usb_claim_interface(usbtr_handle, usbtr_int_number) < 0) {
-		perror("usbtr_open_interface: can't claim interface");
+		perror("rf2500: can't claim interface");
 		usb_close(usbtr_handle);
 		return -1;
 	}
@@ -112,7 +112,7 @@ static int usbtr_send(const u_int8_t *data, int len)
 #endif
 		if (usb_bulk_write(usbtr_handle, USB_FET_OUT_EP,
 			(const char *)pbuf, txlen, 10000) < 0) {
-			perror("usbtr_send");
+			perror("rf2500: can't send data");
 			return -1;
 		}
 
@@ -145,7 +145,7 @@ static int usbtr_recv(u_int8_t *databuf, int max_len)
 		if (usb_bulk_read(usbtr_handle, USB_FET_IN_EP,
 				(char *)usbtr_buf, sizeof(usbtr_buf),
 				10000) < 0) {
-			perror("usbtr_recv");
+			perror("rf2500: can't receive data");
 			return -1;
 		}
 
@@ -203,6 +203,6 @@ const struct fet_transport *rf2500_open(void)
 		}
 	}
 
-	fprintf(stderr, "usbtr_open: no devices could be found\n");
+	fprintf(stderr, "rf2500: no devices could be found\n");
 	return NULL;
 }