diff --git a/main.c b/main.c
index ff5c231e..ccc5f689 100644
--- a/main.c
+++ b/main.c
@@ -2105,8 +2105,12 @@ normalize_mpf(long sign, MPZ_Object *man, PyObject *exp, mp_bitcnt_t bc,
         switch (rnd) {
             case (Py_UCS4)'f':
                 rnd = (Py_UCS4)(sign ? 'u' : 'd');
+                break;
             case (Py_UCS4)'c':
                 rnd = (Py_UCS4)(sign ? 'd' : 'u');
+                break;
+        }
+        switch (rnd) {
             case (Py_UCS4)'d':
                 res = MPZ_rshift1(man, shift);
                 break;
diff --git a/tests/conftest.py b/tests/conftest.py
index c276a865..feaaaf04 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,3 +1,4 @@
+import os
 from datetime import timedelta
 
 import gmp
@@ -17,3 +18,7 @@ def pytest_report_header(config):
   Bits per limb:       {gmp.gmp_info[0]}
   Size of a limb:      {gmp.gmp_info[1]}
 """)
+
+
+def pytest_sessionstart(session):
+    os.environ["MPMATH_NOGMPY"] = "Y"