diff --git a/src/units.js b/src/units.js
index 3bedd2a..f0b1cef 100644
--- a/src/units.js
+++ b/src/units.js
@@ -2,6 +2,7 @@ const a = require('./assert')
 const prep = require('./prepare')
 
 const default_units = {
+    U: 19.05,
     u: 19,
     cx: 18,
     cy: 17
diff --git a/test/cli/big/reference/points/units.yaml b/test/cli/big/reference/points/units.yaml
index 71aa93b..579c750 100644
--- a/test/cli/big/reference/points/units.yaml
+++ b/test/cli/big/reference/points/units.yaml
@@ -1,3 +1,4 @@
+U: 19.05
 u: 19
 cx: 18
 cy: 17
diff --git a/test/cli/minimal/reference/points/units.yaml b/test/cli/minimal/reference/points/units.yaml
index f50c8d8..6df000d 100644
--- a/test/cli/minimal/reference/points/units.yaml
+++ b/test/cli/minimal/reference/points/units.yaml
@@ -1,3 +1,4 @@
+U: 19.05
 u: 19
 cx: 18
 cy: 17
diff --git a/test/index.js b/test/index.js
index f12dd8b..b552c62 100644
--- a/test/index.js
+++ b/test/index.js
@@ -136,10 +136,12 @@ for (let w of cli_what) {
                     const comp_res = dircompare.compareSync(output_path, path.join(t, 'reference'), {
                         compareContent: true
                     })
-                    comp_res.same.should.be.true
-                    if (!dump) {
+                    if (dump) {
+                        fs.moveSync(output_path, path.join(t, 'output'), {overwrite: true})
+                    } else {
                         fs.removeSync(output_path)
                     }
+                    comp_res.same.should.be.true
                 } else {
                     const ref_error = read(t, 'error').replace(version_regex, '<version>')
                     try {
diff --git a/test/points/units___units.json b/test/points/units___units.json
index 9f2a007..48690d9 100644
--- a/test/points/units___units.json
+++ b/test/points/units___units.json
@@ -1,4 +1,5 @@
 {
+    "U": 19.05,
     "u": 19,
     "cx": 18,
     "cy": 17,
diff --git a/test/unit/units.js b/test/unit/units.js
index 19bf781..393090a 100644
--- a/test/unit/units.js
+++ b/test/unit/units.js
@@ -5,7 +5,8 @@ describe('Units', function() {
     it('defaults', function() {
         // check that an empty config has the default units (and nothing more)
         const def = u.parse({})
-        Object.keys(def).length.should.equal(3)
+        Object.keys(def).length.should.equal(4)
+        def.U.should.equal(19.05)
         def.u.should.equal(19)
         def.cx.should.equal(18)
         def.cy.should.equal(17)
@@ -19,7 +20,7 @@ describe('Units', function() {
                 b: 'a + 1'
             }
         })
-        Object.keys(res).length.should.equal(5)
+        Object.keys(res).length.should.equal(6)
         res.a.should.equal(9)
         res.b.should.equal(10)
         // also check that order matters, which it should
@@ -38,11 +39,11 @@ describe('Units', function() {
                 a: 'cx / 2',
             },
             variables: {
-                a: 'u + 1'
+                a: 'U + 1'
             }
         })
-        Object.keys(res).length.should.equal(4)
-        res.a.should.equal(20)
+        Object.keys(res).length.should.equal(5)
+        res.a.should.equal(20.05)
     })
 
 })
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