diff --git a/Misc/NEWS.d/next/Library/2018-06-21-11-35-47.bpo-33916.cZgPCD.rst b/Misc/NEWS.d/next/Library/2018-06-21-11-35-47.bpo-33916.cZgPCD.rst
@@ -0,0 +1,2 @@
diff --git a/Modules/_bz2module.c b/Modules/_bz2module.c
@@ -652,11 +652,15 @@ _bz2_BZ2Decompressor___init___impl(BZ2Decompressor *self)
    int bzerror;

#ifdef WITH_THREAD
-    self->lock = PyThread_allocate_lock();
-    if (self->lock == NULL) {
        PyErr_SetString(PyExc_MemoryError, "Unable to allocate lock");
        return -1;
    }
#endif

    self->needs_input = 1;

diff --git a/Modules/_lzmamodule.c b/Modules/_lzmamodule.c
@@ -1181,11 +1181,15 @@ _lzma_LZMADecompressor___init___impl(Decompressor *self, int format,
    self->lzs.next_in = NULL;

#ifdef WITH_THREAD
-    self->lock = PyThread_allocate_lock();
-    if (self->lock == NULL) {
        PyErr_SetString(PyExc_MemoryError, "Unable to allocate lock");
        return -1;
    }
#endif

    self->check = LZMA_CHECK_UNKNOWN;