diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 577490b6e8a4..72ee6edcf8d7 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,8 @@
+2016-01-20  Torvald Riegel  <triegel@redhat.com>
+
+	PR libstdc++/69310
+	* config/os/bsd/darwin/os_defines.h (_GLIBCXX_USE_WEAK_REF): Define.
+
 2016-01-20  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/60401
diff --git a/libstdc++-v3/config/os/bsd/darwin/os_defines.h b/libstdc++-v3/config/os/bsd/darwin/os_defines.h
index 7e2ed67aea8d..36b660b1b082 100644
--- a/libstdc++-v3/config/os/bsd/darwin/os_defines.h
+++ b/libstdc++-v3/config/os/bsd/darwin/os_defines.h
@@ -47,4 +47,7 @@
 #define _GLIBCXX_USE_NANOSLEEP 1
 #define _GLIBCXX_USE_SCHED_YIELD 1
 
+// No support for referencing weak symbols without a definition.
+#define _GLIBCXX_USE_WEAK_REF 0
+
 #endif