diff --git a/media/webrtc/signaling/src/common/time_profiling/timecard.c b/media/webrtc/signaling/src/common/time_profiling/timecard.c
index e56377534cf5..1cb59b700bbe 100644
--- a/media/webrtc/signaling/src/common/time_profiling/timecard.c
+++ b/media/webrtc/signaling/src/common/time_profiling/timecard.c
@@ -5,6 +5,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include <stdio.h>
+#include <string.h>
 #include "timecard.h"
 #include "mozilla/mozalloc.h"