diff --git a/Misc/NEWS.d/next/Core and Builtins/2017-06-26-14-41-42.bpo-30766.cejWuh.rst b/Misc/NEWS.d/next/Core and Builtins/2017-06-26-14-41-42.bpo-30766.cejWuh.rst
new file mode 100644
index 00000000000000..ba82e6f8f082c7
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2017-06-26-14-41-42.bpo-30766.cejWuh.rst	
@@ -0,0 +1 @@
+Make CHECK_STATUS_PTHREAD signal-safe
diff --git a/Python/thread_pthread.h b/Python/thread_pthread.h
index b95840ce2d76ac..63e651a3e05787 100644
--- a/Python/thread_pthread.h
+++ b/Python/thread_pthread.h
@@ -142,9 +142,19 @@ typedef struct {
     pthread_mutex_t  mut;
 } pthread_lock;
 
+#define PUTS(fd, str) _Py_write_noraise(fd, str, (int)strlen(str))
+
 #define CHECK_STATUS(name)  if (status != 0) { perror(name); error = 1; }
-#define CHECK_STATUS_PTHREAD(name)  if (status != 0) { fprintf(stderr, \
-    "%s: %s\n", name, strerror(status)); error = 1; }
+/* CHECK_STATUS_PTHREAD is async-signal-safe */
+#define CHECK_STATUS_PTHREAD(name) \
+    if (status != 0) { \
+        int _stderr_fd = 2; \
+        PUTS(_stderr_fd, name); \
+        PUTS(_stderr_fd, ": failed with status "); \
+        _Py_DumpDecimal(_stderr_fd, (unsigned long) status); \
+        PUTS(_stderr_fd, "\n"); \
+        error = 1; \
+    }
 
 /*
  * Initialization.