diff --git a/package-lock.json b/package-lock.json
index 678a8e84f..9bd32c176 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -27,7 +27,6 @@
         "postcss-selector-parser": "^6.0.6",
         "postcss-value-parser": "^4.1.0",
         "quick-lru": "^5.1.1",
-        "reduce-css-calc": "^2.1.8",
         "resolve": "^1.20.0",
         "tmp": "^0.2.1"
       },
@@ -3667,11 +3666,6 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/css-unit-converter": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/css-unit-converter/-/css-unit-converter-1.1.2.tgz",
-      "integrity": "sha512-IiJwMC8rdZE0+xiEZHeru6YoONC4rfPMqGm2W85jMIbkFvv5nFTwJVFHam2eFrN6txmoUYFAFXiv8ICVeTO0MA=="
-    },
     "node_modules/css-what": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/css-what/-/css-what-5.0.1.tgz",
@@ -8731,20 +8725,6 @@
         "node": ">=0.10"
       }
     },
-    "node_modules/reduce-css-calc": {
-      "version": "2.1.8",
-      "resolved": "https://registry.npmjs.org/reduce-css-calc/-/reduce-css-calc-2.1.8.tgz",
-      "integrity": "sha512-8liAVezDmUcH+tdzoEGrhfbGcP7nOV4NkGE3a74+qqvE7nt9i4sKLGBuZNOnpI4WiGksiNPklZxva80061QiPg==",
-      "dependencies": {
-        "css-unit-converter": "^1.1.1",
-        "postcss-value-parser": "^3.3.0"
-      }
-    },
-    "node_modules/reduce-css-calc/node_modules/postcss-value-parser": {
-      "version": "3.3.1",
-      "resolved": "https://registry.npmjs.org/postcss-value-parser/-/postcss-value-parser-3.3.1.tgz",
-      "integrity": "sha512-pISE66AbVkp4fDQ7VHBwRNXzAAKJjw4Vw7nWI/+Q3vuly7SNfgYXvm6i5IgFylHGK5sP/xHAbB7N49OS4gWNyQ=="
-    },
     "node_modules/regenerate": {
       "version": "1.4.2",
       "resolved": "https://registry.npmjs.org/regenerate/-/regenerate-1.4.2.tgz",
@@ -13077,11 +13057,6 @@
         }
       }
     },
-    "css-unit-converter": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/css-unit-converter/-/css-unit-converter-1.1.2.tgz",
-      "integrity": "sha512-IiJwMC8rdZE0+xiEZHeru6YoONC4rfPMqGm2W85jMIbkFvv5nFTwJVFHam2eFrN6txmoUYFAFXiv8ICVeTO0MA=="
-    },
     "css-what": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/css-what/-/css-what-5.0.1.tgz",
@@ -16841,22 +16816,6 @@
         "readable-stream": "^2.0.2"
       }
     },
-    "reduce-css-calc": {
-      "version": "2.1.8",
-      "resolved": "https://registry.npmjs.org/reduce-css-calc/-/reduce-css-calc-2.1.8.tgz",
-      "integrity": "sha512-8liAVezDmUcH+tdzoEGrhfbGcP7nOV4NkGE3a74+qqvE7nt9i4sKLGBuZNOnpI4WiGksiNPklZxva80061QiPg==",
-      "requires": {
-        "css-unit-converter": "^1.1.1",
-        "postcss-value-parser": "^3.3.0"
-      },
-      "dependencies": {
-        "postcss-value-parser": {
-          "version": "3.3.1",
-          "resolved": "https://registry.npmjs.org/postcss-value-parser/-/postcss-value-parser-3.3.1.tgz",
-          "integrity": "sha512-pISE66AbVkp4fDQ7VHBwRNXzAAKJjw4Vw7nWI/+Q3vuly7SNfgYXvm6i5IgFylHGK5sP/xHAbB7N49OS4gWNyQ=="
-        }
-      }
-    },
     "regenerate": {
       "version": "1.4.2",
       "resolved": "https://registry.npmjs.org/regenerate/-/regenerate-1.4.2.tgz",
diff --git a/package.json b/package.json
index 5392c7b0f..c5f127bea 100644
--- a/package.json
+++ b/package.json
@@ -86,7 +86,6 @@
     "postcss-selector-parser": "^6.0.6",
     "postcss-value-parser": "^4.1.0",
     "quick-lru": "^5.1.1",
-    "reduce-css-calc": "^2.1.8",
     "resolve": "^1.20.0",
     "tmp": "^0.2.1"
   },
diff --git a/src/util/negateValue.js b/src/util/negateValue.js
index ad0ac8db1..da7a5cf2c 100644
--- a/src/util/negateValue.js
+++ b/src/util/negateValue.js
@@ -1,9 +1,14 @@
-import reduceCalc from 'reduce-css-calc'
-
 export default function (value) {
-  try {
-    return reduceCalc(`calc(${value} * -1)`)
-  } catch (e) {
-    return value
+  value = `${value}`
+
+  // Flip sign of numbers
+  if (/^[+-]?(\d+|\d*\.\d+)(e[+-]?\d+)?(%|\w+)?$/.test(value)) {
+    return value.replace(/^[+-]?/, (sign) => (sign === '-' ? '' : '-'))
   }
+
+  if (value.includes('var(') || value.includes('calc(')) {
+    return `calc(${value} * -1)`
+  }
+
+  return value
 }
diff --git a/tests/resolveConfig.test.js b/tests/resolveConfig.test.js
index bcba03bde..b5b6147ef 100644
--- a/tests/resolveConfig.test.js
+++ b/tests/resolveConfig.test.js
@@ -1320,13 +1320,16 @@ test('custom properties are multiplied by -1 for negative values', () => {
   const userConfig = {
     theme: {
       spacing: {
+        0: 0,
         1: '1px',
         2: '2px',
         3: '3px',
         4: '4px',
+        auto: 'auto',
         foo: 'var(--foo)',
         bar: 'var(--bar, 500px)',
         baz: 'calc(50% - 10px)',
+        qux: '10poops',
       },
       margin: (theme, { negative }) => ({
         ...theme('spacing'),
@@ -1345,38 +1348,39 @@ test('custom properties are multiplied by -1 for negative values', () => {
 
   const result = resolveConfig([userConfig, defaultConfig])
 
-  expect(result).toMatchObject({
-    prefix: '-',
-    important: false,
-    separator: ':',
-    theme: {
-      spacing: {
-        1: '1px',
-        2: '2px',
-        3: '3px',
-        4: '4px',
-        foo: 'var(--foo)',
-        bar: 'var(--bar, 500px)',
-        baz: 'calc(50% - 10px)',
-      },
-      margin: {
-        1: '1px',
-        2: '2px',
-        3: '3px',
-        4: '4px',
-        foo: 'var(--foo)',
-        bar: 'var(--bar, 500px)',
-        baz: 'calc(50% - 10px)',
-        '-1': '-1px',
-        '-2': '-2px',
-        '-3': '-3px',
-        '-4': '-4px',
-        '-foo': 'calc(var(--foo) * -1)',
-        '-bar': 'calc(var(--bar, 500px) * -1)',
-        '-baz': 'calc(-50% - -10px)',
-      },
-    },
-    variants: {},
+  expect(result.theme.spacing).toEqual({
+    0: 0,
+    1: '1px',
+    2: '2px',
+    3: '3px',
+    4: '4px',
+    auto: 'auto',
+    foo: 'var(--foo)',
+    bar: 'var(--bar, 500px)',
+    baz: 'calc(50% - 10px)',
+    qux: '10poops',
+  })
+  expect(result.theme.margin).toEqual({
+    0: 0,
+    1: '1px',
+    2: '2px',
+    3: '3px',
+    4: '4px',
+    auto: 'auto',
+    foo: 'var(--foo)',
+    bar: 'var(--bar, 500px)',
+    baz: 'calc(50% - 10px)',
+    qux: '10poops',
+    '-0': '-0',
+    '-1': '-1px',
+    '-2': '-2px',
+    '-3': '-3px',
+    '-4': '-4px',
+    '-auto': 'auto',
+    '-foo': 'calc(var(--foo) * -1)',
+    '-bar': 'calc(var(--bar, 500px) * -1)',
+    '-baz': 'calc(calc(50% - 10px) * -1)',
+    '-qux': '-10poops',
   })
 })