diff --git a/lib/nodes/loopback.c b/lib/nodes/loopback.c
index d2b5c754e..d332ff9c8 100644
--- a/lib/nodes/loopback.c
+++ b/lib/nodes/loopback.c
@@ -20,6 +20,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *********************************************************************************/
 
+#include <string.h>
+
 #include <villas/node.h>
 #include <villas/plugin.h>
 #include <villas/config.h>