diff --git a/src/rtapi/uspace_rtapi_app.cc b/src/rtapi/uspace_rtapi_app.cc
index 8e3746e0af8..35c1214ddbe 100644
--- a/src/rtapi/uspace_rtapi_app.cc
+++ b/src/rtapi/uspace_rtapi_app.cc
@@ -21,6 +21,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <errno.h>
 
 std::atomic_int WithRoot::level;
 uid_t WithRoot::ruid, WithRoot::euid;
@@ -285,4 +286,4 @@ void RtapiApp::set_namef(const char *fmt, ...) {
         fprintf(stderr, "pthread_setname_np() failed for %s: %d\n", buf, res);
     }
     free(buf);
-}
\ No newline at end of file
+}