diff --git a/src/lib/cdev/posix/cdev_platform.cpp b/src/lib/cdev/posix/cdev_platform.cpp
index c643792f0a..c6a9853f66 100644
--- a/src/lib/cdev/posix/cdev_platform.cpp
+++ b/src/lib/cdev/posix/cdev_platform.cpp
@@ -201,6 +201,7 @@ extern "C" {
 		}
 
 		if (ret < 0) {
+			errno = -ret;
 			return -1;
 		}