diff --git a/src/system/libroot/posix/pthread/Jamfile b/src/system/libroot/posix/pthread/Jamfile
index 9a37630f10..c29f43d23c 100644
--- a/src/system/libroot/posix/pthread/Jamfile
+++ b/src/system/libroot/posix/pthread/Jamfile
@@ -25,7 +25,7 @@ for architectureObject in [ MultiArchSubDirSetup ] {
 			pthread_mutexattr.c
 			pthread_once.cpp
 			pthread_rwlock.cpp
-			pthread_spinlock.c
+			pthread_spinlock.cpp
 			;
 	}
 }
diff --git a/src/system/libroot/posix/pthread/pthread_spinlock.c b/src/system/libroot/posix/pthread/pthread_spinlock.cpp
similarity index 100%
rename from src/system/libroot/posix/pthread/pthread_spinlock.c
rename to src/system/libroot/posix/pthread/pthread_spinlock.cpp