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-rw-r--r--linuxthreads/mutex.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/linuxthreads/mutex.c b/linuxthreads/mutex.c
index 5955c575d9..3ad27942af 100644
--- a/linuxthreads/mutex.c
+++ b/linuxthreads/mutex.c
@@ -14,6 +14,7 @@
 
 /* Mutexes */
 
+#include <bits/libc-lock.h>
 #include <errno.h>
 #include <sched.h>
 #include <stddef.h>