diff --git a/transport/ftdi.c b/transport/ftdi.c
index 1444933..52c634a 100644
--- a/transport/ftdi.c
+++ b/transport/ftdi.c
@@ -286,6 +286,7 @@ transport_t ftdi_open(const char *devpath,
 
 	if (open_device(tr, dev, baud_rate) < 0) {
 		printc_err("ftdi: failed to open device\n");
+		free(tr);
 		return NULL;
 	}
 
diff --git a/transport/rf2500.c b/transport/rf2500.c
index a8b56c8..3510edc 100644
--- a/transport/rf2500.c
+++ b/transport/rf2500.c
@@ -250,6 +250,7 @@ transport_t rf2500_open(const char *devpath, const char *requested_serial)
 
 	if (open_device(tr, dev) < 0) {
 		printc_err("rf2500: failed to open RF2500 device\n");
+		free(tr);
 		return NULL;
 	}
 
diff --git a/transport/ti3410.c b/transport/ti3410.c
index 5c17b32..4c057ee 100644
--- a/transport/ti3410.c
+++ b/transport/ti3410.c
@@ -605,6 +605,7 @@ transport_t ti3410_open(const char *devpath, const char *requested_serial)
 
 	if (open_device(tr, dev) < 0) {
 		printc_err("ti3410: failed to open TI3410 device\n");
+		free(tr);
 		return NULL;
 	}