diff --git a/src/python/bytesize.py b/src/python/bytesize.py
index a441d1e..8850498 100644
--- a/src/python/bytesize.py
+++ b/src/python/bytesize.py
@@ -81,6 +81,12 @@ def get_error(err):
     c_bytesize.bs_clear_error(byref(err))
     raise ex
 
+class SizeUnit(ctypes.Union):
+    _fields_ = [
+        ("bunit", ctypes.c_int),
+        ("dunit", ctypes.c_int),
+    ]
+
 class SizeStruct(ctypes.Structure):
     @classmethod
     def new(cls):
@@ -155,7 +161,12 @@ def cmp_bytes(self, b, ign_sgn):
 
     def convert_to(self, unit):
         err = POINTER(SizeErrorStruct)()
-        ret = c_bytesize.bs_size_convert_to(self, unit, byref(err))
+        u = SizeUnit()
+        if unit >= KB:
+            u.dunit = unit
+        else:
+            u.bunit = unit
+        ret = c_bytesize.bs_size_convert_to(self, u, byref(err))
         get_error(err)
         ret = str(ret, "utf-8")
         return ret
@@ -264,7 +275,7 @@ def __repr__(self):
 c_bytesize.bs_size_get_bytes_str.restype = ctypes.c_char_p
 c_bytesize.bs_size_get_bytes_str.argtypes = [POINTER(SizeStruct)]
 c_bytesize.bs_size_convert_to.restype = ctypes.c_char_p
-c_bytesize.bs_size_convert_to.argtypes = [POINTER(SizeStruct), ctypes.c_int, POINTER(POINTER(SizeErrorStruct))]
+c_bytesize.bs_size_convert_to.argtypes = [POINTER(SizeStruct), SizeUnit, POINTER(POINTER(SizeErrorStruct))]
 c_bytesize.bs_size_human_readable.restype = ctypes.c_char_p
 c_bytesize.bs_size_human_readable.argtypes = [POINTER(SizeStruct), ctypes.c_int, ctypes.c_int, ctypes.c_bool]
 
diff --git a/tests/canary_tests.sh.in b/tests/canary_tests.sh.in
index d5a5815..8b52373 100644
--- a/tests/canary_tests.sh.in
+++ b/tests/canary_tests.sh.in
@@ -6,8 +6,12 @@ if [ @WITH_PYTHON3@ != 1 ]; then
     exit 0
 fi
 
-DISTRO=`busctl get-property org.freedesktop.hostname1 /org/freedesktop/hostname1 org.freedesktop.hostname1 OperatingSystemCPEName | cut -d ":" -f 3`
-if [ $DISTRO == "centos" -o $DISTRO == "enterprise_linux" ]; then
+DISTRO=$(busctl get-property org.freedesktop.hostname1 \
+    /org/freedesktop/hostname1 \
+    org.freedesktop.hostname1 OperatingSystemCPEName |
+    cut -d ":" -f 3)
+
+if [ "$DISTRO" = "centos" ] || [ "$DISTRO" = "enterprise_linux" ]; then
     echo "Cannot run translations tests on CentOS/RHEL 7, skipping."
     exit 0
 fi
diff --git a/tests/libbytesize_unittest.py b/tests/libbytesize_unittest.py
index 24dffeb..e958866 100755
--- a/tests/libbytesize_unittest.py
+++ b/tests/libbytesize_unittest.py
@@ -9,7 +9,7 @@
 
 from locale_utils import get_avail_locales, missing_locales, requires_locales
 
-from bytesize import KiB, GiB, ROUND_UP, ROUND_DOWN, ROUND_HALF_UP, OverflowError, InvalidSpecError
+from bytesize import KiB, MB, GiB, ROUND_UP, ROUND_DOWN, ROUND_HALF_UP, OverflowError, InvalidSpecError
 
 # SizeStruct is part of the 'private' API and needs to be imported differently
 # when running from locally build tree and when using installed library
@@ -365,8 +365,11 @@ def testCmpBytes(self):
     #enddef
 
     def testConvertTo(self):
-        x = SizeStruct.new_from_str("1 KiB")
-        x.convert_to(KiB)
+        x = SizeStruct.new_from_str("1 MiB")
+        self.assertEqual(x.convert_to(KiB), "1024")
+
+        x = SizeStruct.new_from_str("1 GB")
+        self.assertEqual(x.convert_to(MB), "1000")
     #enddef
 
     def testDiv(self):