diff --git a/Misc/NEWS.d/next/Library/2019-01-29-09-11-09.bpo-35847.eiSi4t.rst b/Misc/NEWS.d/next/Library/2019-01-29-09-11-09.bpo-35847.eiSi4t.rst
new file mode 100644
index 00000000000..e3775f96f36
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-01-29-09-11-09.bpo-35847.eiSi4t.rst
@@ -0,0 +1 @@
+RISC-V needed the CTYPES_PASS_BY_REF_HACK.  Fixes ctypes Structure test_pass_by_value.
diff --git a/Modules/_ctypes/callproc.c b/Modules/_ctypes/callproc.c
index a7965c19b70..bed53640202 100644
--- a/Modules/_ctypes/callproc.c
+++ b/Modules/_ctypes/callproc.c
@@ -1058,7 +1058,7 @@ GetComError(HRESULT errcode, GUID *riid, IUnknown *pIunk)
 #endif
 
 #if (defined(__x86_64__) && (defined(__MINGW64__) || defined(__CYGWIN__))) || \
-    defined(__aarch64__)
+    defined(__aarch64__) || defined(__riscv)
 #define CTYPES_PASS_BY_REF_HACK
 #define POW2(x) (((x & ~(x - 1)) == x) ? x : 0)
 #define IS_PASS_BY_REF(x) (x > 8 || !POW2(x))