diff --git a/lib/compare.js b/lib/compare.js
index 99f1244..958d557 100644
--- a/lib/compare.js
+++ b/lib/compare.js
@@ -1,61 +1,7 @@
 'use strict';
 
 const semver = require('semver');
-
-/**
- * Helper method to convert a version string to a semver string for comparison.
- *
- * @param {string} string
- *   The string to convert.
- *
- * @return {string}
- *   A semver string from string.
- *
- * @throws {Error}
- *   Thrown if the string could not be converted to a semver.
- */
-const toSemver = (string) => {
-  if (semver.valid(string)) {
-    return string;
-  }
-
-  // Try cleaning the string just in case.
-  const cleanString = semver.clean(string);
-  if (semver.valid(cleanString)) {
-    return cleanString;
-  }
-
-  // Do we even have a number?
-  if (!string.match(/\d+/)) {
-    throw new Error(`Unable to compare version string: ${string}`);
-  }
-
-  // Special case for bare numbers.
-  if (string.match(/^\d+$/)) {
-    return toSemver(`${string}.0.0`);
-  }
-
-  // Split the version string on dots, and try to convert to a semver.
-  const versionFrags = string.split(/(\d+)\./).filter(frag => frag !== '' && frag.match(/^\d/));
-
-  if (versionFrags.length === 0) {
-    return toSemver(string.replace(/(\d+)/, '$1.0.0'));
-  }
-  else if (versionFrags.length === 2) {
-    let stillCollecting = true;
-    const replace = versionFrags.join('.').split(/([^\d]+)/).filter((frag) => {
-      if (!stillCollecting) {
-        return false;
-      }
-
-      stillCollecting = (frag === '.' || frag.match(/^\d+$/));
-      return stillCollecting;
-    }).join('');
-    return toSemver(string.replace(replace, `${replace}.0`));
-  }
-
-  throw new Error(`Unable to compare version string: ${string}`);
-};
+const toSemver = require('./toSemver');
 
 /**
  * Compares two version strings by first converting them to semvers.
diff --git a/lib/toSemver.js b/lib/toSemver.js
new file mode 100644
index 0000000..6fd9f18
--- /dev/null
+++ b/lib/toSemver.js
@@ -0,0 +1,59 @@
+'use strict';
+
+const semver = require('semver');
+/**
+ * Helper method to convert a version string to a semver string for comparison.
+ *
+ * @param {string} string
+ *   The string to convert.
+ *
+ * @return {string}
+ *   A semver string from string.
+ *
+ * @throws {Error}
+ *   Thrown if the string could not be converted to a semver.
+ */
+const toSemver = (string) => {
+  if (semver.valid(string)) {
+    return string;
+  }
+
+  // Try cleaning the string just in case.
+  const cleanString = semver.clean(string);
+  if (semver.valid(cleanString)) {
+    return cleanString;
+  }
+
+  // Do we even have a number?
+  if (!string.match(/\d+/)) {
+    throw new Error(`Unable to compare version string: ${string}`);
+  }
+
+  // Special case for bare numbers.
+  if (string.match(/^\d+$/)) {
+    return toSemver(`${string}.0.0`);
+  }
+
+  // Split the version string on dots, and try to convert to a semver.
+  const versionFrags = string.split(/(\d+)\./).filter(frag => frag !== '' && frag.match(/^\d/));
+
+  if (versionFrags.length === 0) {
+    return toSemver(string.replace(/(\d+)/, '$1.0.0'));
+  }
+  else if (versionFrags.length === 2) {
+    let stillCollecting = true;
+    const replace = versionFrags.join('.').split(/([^\d]+)/).filter((frag) => {
+      if (!stillCollecting) {
+        return false;
+      }
+
+      stillCollecting = (frag === '.' || frag.match(/^\d+$/));
+      return stillCollecting;
+    }).join('');
+    return toSemver(string.replace(replace, `${replace}.0`));
+  }
+
+  throw new Error(`Unable to compare version string: ${string}`);
+};
+
+module.exports = toSemver;