diff --git a/HISTORY.rst b/HISTORY.rst
index 67213b2ca..c193dfc8c 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -37,6 +37,7 @@
     None
 - 1046_: [Windows] disk_partitions() on Windows overrides user's SetErrorMode.
 - 1047_: [Windows] Process username(): memory leak in case exception is thrown.
+- 1050_: [Windows] Process.memory_maps memory() leaks memory.
 
 *2017-04-10*
 
diff --git a/psutil/_psutil_windows.c b/psutil/_psutil_windows.c
index 69d1fdfda..20d20b824 100644
--- a/psutil/_psutil_windows.c
+++ b/psutil/_psutil_windows.c
@@ -2920,6 +2920,7 @@ psutil_proc_memory_maps(PyObject *self, PyObject *args) {
             if (PyList_Append(py_retlist, py_tuple))
                 goto error;
             Py_DECREF(py_tuple);
+            Py_DECREF(py_str);
         }
         previousAllocationBase = basicInfo.AllocationBase;
         baseAddress = (PCHAR)baseAddress + basicInfo.RegionSize;