diff --git a/src/target/oocd_trace.c b/src/target/oocd_trace.c
index 2969cc1e1..e723efe04 100644
--- a/src/target/oocd_trace.c
+++ b/src/target/oocd_trace.c
@@ -38,6 +38,8 @@ static int oocd_trace_read_reg(struct oocd_trace *oocd_trace, int reg, uint32_t
 
 	cmd = 0x10 | (reg & 0x7);
 	bytes_written = write(oocd_trace->tty_fd, &cmd, 1);
+	if (bytes_written < 1)
+		return ERROR_FAIL;
 
 	bytes_to_read = 4;
 	while (bytes_to_read > 0) {
@@ -62,6 +64,9 @@ static int oocd_trace_write_reg(struct oocd_trace *oocd_trace, int reg, uint32_t
 	data[4] = (value & 0xff000000) >> 24;
 
 	bytes_written = write(oocd_trace->tty_fd, data, 5);
+	if (bytes_written < 5)
+		return ERROR_FAIL;
+
 	LOG_DEBUG("reg #%i: 0x%8.8x", reg, value);
 
 	return ERROR_OK;
@@ -78,6 +83,8 @@ static int oocd_trace_read_memory(struct oocd_trace *oocd_trace, uint8_t *data,
 
 	cmd = 0x20;
 	bytes_written = write(oocd_trace->tty_fd, &cmd, 1);
+	if (bytes_written < 1)
+		return ERROR_FAIL;
 
 	bytes_to_read = size * 16;
 	while (bytes_to_read > 0) {
@@ -358,6 +365,8 @@ COMMAND_HANDLER(handle_oocd_trace_resync_command)
 	cmd_array[0] = 0xf0;
 
 	bytes_written = write(oocd_trace->tty_fd, cmd_array, 1);
+	if (bytes_written < 1)
+		return ERROR_FAIL;
 
 	command_print(CMD_CTX, "requesting traceclock resync");
 	LOG_DEBUG("resyncing traceclk pll");